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Fuel log graph
Efficiency log for: Maus - 1994 Honda Civic VX
  • Lifetime Fuel Economy: 49.6 mpg (US), 4.7 L/100 km, 59.6 mpg (Imp)
  • 90-day Fuel Economy: 54.3 mpg (US), 4.3 L/100 km, 65.2 mpg (Imp)
  • 3-tank Fuel Economy: 55.6 mpg (US), 4.2 L/100 km, 66.8 mpg (Imp)
  • EPA Combined Rating / % over rating: 40 mpg (US) / 35.8% (based on 90-day fuel economy)
  • Total fills: 52
  • Average cost per gal/L: $2.70 per gal (US); $0.00 per L (price data entered for 52 fill/s)
  • Average cost per fill: $23.46
  • Average distance cost: $0.05 per mi. / $0.03 per km
  • Total fuel used: 451.76 gal (US), 1710.1 L
  • Total distance traveled: 22415.3 mi. / 36073.9 km
  • Total cost: $1,219.72
  • Total fuel saved vs. EPA: 108.6 gal. (US) / 411.1 L
  • Total saved: $293.22 (based on avg. cost per gal./L)
  • Average tank distance: 431.1 mi. / 693.7 km
Fill date Distance Fill amount Price Fuel Economy Details
2010-10-25 430 mi
692.02 km
7.392 gal (US)
6.15 gal (Imp)
27.98 L
249.11 kWh
$2.929
($21.65 total for this fill)
58.17 mpg (US)
69.92 mpg (Imp)
4.04 L/100 km
1.72 gal (US)/100 mi
579.33 Wh/mi
Gave up on speedo value. Using GPS value of 430.0 instead of MPGuino value of 429.3 due to some EOC (no engine kill switch installed yet).

Filled up at the "bottom" of my commute cycle; last fillup was at the "top". That definitely helped my FE a little.
2010-10-10 470.8 mi
757.68 km
8.878 gal (US)
7.39 gal (Imp)
33.61 L
299.19 kWh
$2.949
($26.18 total for this fill)
53.03 mpg (US)
63.71 mpg (Imp)
4.44 L/100 km
1.89 gal (US)/100 mi
635.49 Wh/mi
Gave up on speedo value. Using GPS value of 470.8 instead of MPGuino value of 470.0 due to some EOC (no engine kill switch installed yet).

Filled up at the "top" of my commute cycle; last fillup was at the "bottom".

More details to come (running behind!!)

Included a long drive to Reno and back (averaged 50mpg there and nearly 65mpg back!!).
2010-10-03 453.5 mi
729.84 km
8.084 gal (US)
6.73 gal (Imp)
30.6 L
272.43 kWh
$2.759
($22.3 total for this fill)
56.1 mpg (US)
67.38 mpg (Imp)
4.19 L/100 km
1.78 gal (US)/100 mi
600.73 Wh/mi
Gave up on speedo value. Using GPS value of 453.5 instead of MPGuino value of 432.3 due to some EOC (no engine kill switch installed yet).

Filled up at the "bottom" of my commute cycle; last fillup was at the "bottom".

A couple of changes, just this weekend and just before the fillup:
- folded psgr mirror (had to jam some cardboard into the joint so it would stay folded... we'll see how long it lasts)
- removed AC belt (don't expect much out of this one, but no point in turning something I don't expect to use anymore 'til summer... we'll see how defrosting works out when it's cold and wet)

More info to come...
2010-09-17 500 mi
804.67 km
8.716 gal (US)
7.26 gal (Imp)
32.99 L
293.73 kWh
$2.859
($24.92 total for this fill)
57.37 mpg (US)
68.87 mpg (Imp)
4.1 L/100 km
1.74 gal (US)/100 mi
587.46 Wh/mi
Gave up on speedo value. Using GPS value of 499.95 instead of MPGuino value of 496.8 due to some EOC (no engine kill switch installed yet).

Filled up at the "bottom" of my commute cycle; last fillup was at the "top". This skews my tank FE to the positive side a bit.

More info to come...
2010-09-04 452.1 mi
727.58 km
8.679 gal (US)
7.23 gal (Imp)
32.85 L
292.48 kWh
$2.959
($25.68 total for this fill)
52.09 mpg (US)
62.53 mpg (Imp)
4.51 L/100 km
1.92 gal (US)/100 mi
646.94 Wh/mi
Gave up on speedo value. Using GPS value of 452.1 instead of MPGuino value of 449.1 due to some EOC (no engine kill switch installed yet).

Filled up at the "top" of my commute cycle.

Realized I probably should include in the logs whether the fillup was done that the "top" of my commute cycle or at the "bottom". There are two gas stations I consistently go to, one near work (at the "bottom" of the hill) and one near home (at the "top" of the hill). Since I often get approx 1/2 the FE going uphill vs going downhill, the location where I fill up will certainly have an effect on the overall tank FE.

Decided to commute home primarily by freeway since even my best FE going surface will use more fuel than my worst FE going freeway due to the extra distance I have to drive going surface. So I will sacrifice better FE numbers for less fuel used overall.

Removed my aero addons (grill block, single wheel cover) about half way through this tank in order to do some work on the car and had them off the rest of this tank; seemed as if I could really feel the increased drag on my downhill glides once I did that, but did no official measurement. Per-trip FE before and after did not change much, because my To Home FE improved after the removal while my To Work FE got worse.

Basic stats for this tank:
- ~28% EOC (includes some DFCO)
- 9% of total tank miles for errands (surprisingly low!)
- ~33mph avs
- To Work high of 88.38mpg over 22.5mi (47% EOC)
- From Work high of 44.29mpg over 22.7mi (12% EOC)
(Note that the calibration is not perfect, but it's pretty close)
2010-08-21 499.3 mi
803.55 km
9.192 gal (US)
7.65 gal (Imp)
34.8 L
309.77 kWh
$2.959
($27.2 total for this fill)
54.32 mpg (US)
65.27 mpg (Imp)
4.33 L/100 km
1.84 gal (US)/100 mi
620.41 Wh/mi
Gave up on speedo value. Using GPS value of 499.3 instead of MPGuino value of 495.21 due to some EOC (no engine kill switch installed yet).

Filled up at the "bottom" of my commute cycle.

Still calibrating the MPGuino; tank fill was 9.19g; mpguino showed 8.88g.

With MPGuino, found that commuting to work by freeway (with higher avg speed) will often result in better FE than by surface, especially if I can draft a slow truck. And going by freeway will *always* result in less fuel consumed (due to the shorter distance).

Best FE commuting to work according to the (uncalibrated) mpguino was 88.6mpg (!), which was by freeway, included ~44% of the distance EOC'd, but included no drafting.

Commuting home is still a toss up. I'm finding that using freeway to go back up hill will more often than not result in worse FE than going by surface, and the fuel used on a bad freeway FE commute is about the same as a good surface FE commute. If I can find a technique where I get consistently 'good' FE on the freeway, then I would prefer to commute by freeway always (less time, less fuel).

Best FE commuting home according to the (uncalibrated) mpguino was 45.6mpg, which was surface, included ~20% of the distance EOC'd, but included no drafting.

Errand ratio was a more typical 16% this tank. Becoming much more aggressive with the EOC lately, especially because I'm seeing the immediate effect on the mpguino display.
2010-08-09 467.3 mi
752.05 km
8.346 gal (US)
6.95 gal (Imp)
31.59 L
281.26 kWh
$2.959
($24.7 total for this fill)
55.99 mpg (US)
67.24 mpg (Imp)
4.2 L/100 km
1.79 gal (US)/100 mi
601.88 Wh/mi
Gave up on speedo value. Using GPS value of 467.3 instead due to intermittent speedo outage.

Continued speedo problems, but less worried about that now because I have the MPGuino plus a GPS to tell me my current speed.

Wow! Best tank ever!! This is the first tank where I had the MPGuino installed, and what a difference it makes to be able to see my instant FE and my current trip FE! Adjusted my driving style to best take advantage of the lean burn capabilities of the Maus, which obviously really helped the overall FE.

Also had a bit higher percentage of errands vs commuting this tank... ~33%, though I don't believe that had as much of an impact as getting the immediate feedback.

Another slight change in this tank is that (due to the cooler weather), I'm able to drive more with closed windows than the last few tanks.

Have been doing more & more EOC as a result of the immediate feedback, as I can see the big impact EOC has on the trip FE.

MPGuino is not calibrated yet, so won't share any per-trip bests until I feel it's better calibrated.
2010-07-30 460 mi
740.3 km
9.42 gal (US)
7.84 gal (Imp)
35.66 L
317.45 kWh
$2.959
($27.87 total for this fill)
48.83 mpg (US)
58.67 mpg (Imp)
4.82 L/100 km
2.05 gal (US)/100 mi
690.11 Wh/mi
Gave up on speedo value. Using GPS value of 460.0 instead due to intermittent speedo outage.

Continued speedo problems.

Ran several more errands than usual on this tank, about 24% worth. Also spent more time on the freeway again, with an avg speed of about 48mph; surface street speeds avg about 37mph.

Overall, relatively hot weather over this tank.
2010-07-14 446.8 mi
719.05 km
8.529 gal (US)
7.1 gal (Imp)
32.29 L
287.43 kWh
$2.999
($25.58 total for this fill)
52.39 mpg (US)
62.93 mpg (Imp)
4.49 L/100 km
1.91 gal (US)/100 mi
643.31 Wh/mi
Gave up on speedo value. Using GPS value of 446.8 instead due to intermittent speedo outage.

Continued speedo problems.

Starting to do a little bit of EOC on this tank. The aero mods *seem* to be helping out, but this is seat of pants only... seems like I'm able to glide quite a bit longer. Commuted by freeway "to work" more often this tank. Freeway commute avg speed (including pre- and post- freeway portions) was about 46mph; Surface commute avg speed ("from work") was about 34mph.

About 14% errands.
2010-07-02 431 mi
693.63 km
8.788 gal (US)
7.32 gal (Imp)
33.27 L
296.16 kWh
$2.999
($26.36 total for this fill)
49.04 mpg (US)
58.88 mpg (Imp)
4.8 L/100 km
2.04 gal (US)/100 mi
687.15 Wh/mi
Gave up on speedo value. Using GPS value of 431.0 instead due to intermittent speedo outage.

Continued speedo problems.

About 13% errands vs commuting. Clear and sunny throughout this tank, with temps warm to hot. A few commutes by freeway. Average speed for commutes is at ~37mph; for errands, ~25mph.

Some EOC on this tank, along with some P&G.

Began experimenting with some aero mods this tank, including grill block, one wheel cover, and one skirt.
2010-06-22 480.7 mi
773.61 km
9.114 gal (US)
7.59 gal (Imp)
34.5 L
307.14 kWh
$2.879
($26.24 total for this fill)
52.74 mpg (US)
63.33 mpg (Imp)
4.46 L/100 km
1.9 gal (US)/100 mi
638.94 Wh/mi
Gave up on speedo value. Using GPS value of 480.7 instead due to intermittent speedo outage.

Continued speedo problems.

Back to about 15% errands vs commuting. Clear and sunny throughout this tank, with temps cool to hot. A couple of longer drives and a few more commutes by freeway. Average speed for commutes is at ~40mph; for errands, ~37mph.

No EOC on this tank, and very little P&G.
2010-06-10 462.8 mi
744.8 km
9.303 gal (US)
7.75 gal (Imp)
35.22 L
313.51 kWh
$2.869
($26.69 total for this fill)
49.75 mpg (US)
59.72 mpg (Imp)
4.73 L/100 km
2.01 gal (US)/100 mi
677.42 Wh/mi
Gave up on speedo value. Using GPS value of 462.8 instead due to intermittent speedo outage.

Continued speedo problems.

About 20% errands vs commuting this time. Weather was all over the place, with rain some days, cold other days, and then really warm on other days.

Average commuting speed was ~37mph; Average errand speed was ~31.5mph.

No EOC and very little P&G.
2010-05-30 399.9 mi
643.58 km
7.985 gal (US)
6.65 gal (Imp)
30.23 L
269.09 kWh
$2.919
($23.31 total for this fill)
50.08 mpg (US)
60.14 mpg (Imp)
4.7 L/100 km
2 gal (US)/100 mi
672.89 Wh/mi
Odo indicated 208.4. Using GPS value of 399.9 instead due to intermittent speedo outage.

Continued speedo problems.

The notoriously inaccurate fuel gauge caused me to think I had much less fuel left than I actually did... I typically go until the 10 gallon tank has only a gallon left in it. Not sure if this is related to the Fed ECU or just an anomaly.

The last week was relatively yukky weather; some rain and generally cold. Almost 100% commuting this tank, no EOC.
2010-05-19 435.3 mi
700.55 km
8.671 gal (US)
7.22 gal (Imp)
32.82 L
292.21 kWh
$2.929
($25.4 total for this fill)
50.2 mpg (US)
60.29 mpg (Imp)
4.68 L/100 km
1.99 gal (US)/100 mi
671.28 Wh/mi
Odo indicated 296. Using GPS value of 435.3 instead due to intermittent speedo outage.

Continued speedo problems.

Re-installed the Fed ECU on this tank. Had taken it off when I started to notice my idle issues. I still have them but not as bad. Had replaced the rubber gasket that went between the PVC pipe and the oil breather.

Mostly nice weather on this tank. Also worked from home for one week, which helped stretch this tank out. About 13% errands on this tank. No EOC.
2010-05-01 440.5 mi
708.92 km
9.028 gal (US)
7.52 gal (Imp)
34.17 L
304.24 kWh
$2.889
($26.08 total for this fill)
48.79 mpg (US)
58.58 mpg (Imp)
4.82 L/100 km
2.05 gal (US)/100 mi
690.67 Wh/mi
Odo indicated 276.5. Using GPS value of 440.5 instead due to intermittent speedo outage.

Continued speedo problems.

Some pretty good rain this tank, with a few days that were dry but cool. A little less than 15% errands; the rest was commuting. No EOC.
2010-04-21 431.7 mi
694.75 km
8.8 gal (US)
7.33 gal (Imp)
33.31 L
296.56 kWh
$2.889
($25.42 total for this fill)
49.06 mpg (US)
58.89 mpg (Imp)
4.79 L/100 km
2.04 gal (US)/100 mi
686.96 Wh/mi
Odo indicated 293.3. Using GPS value of 431.7 instead due to intermittent speedo outage.

Continued speedo problems.

Mixed weather again; some rain and relatively cold weather. About 15% errands; the rest was commuting. No EOC. Not much else to say about this tank.
2010-04-09 487.3 mi
784.23 km
9.408 gal (US)
7.83 gal (Imp)
35.61 L
317.05 kWh
$2.889
($27.18 total for this fill)
51.8 mpg (US)
62.23 mpg (Imp)
4.54 L/100 km
1.93 gal (US)/100 mi
650.63 Wh/mi
Odo indicated 357.7. Using GPS value of 487.3 instead due to intermittent speedo outage.

Continued speedo problems.

Mix of good and bad weather during this tank, though this past week was particularly good. Less than 10% of this tank was spent doing errands. Average speed for the tank was 35.91mph
2010-03-26 477.6 mi
768.62 km
9.218 gal (US)
7.67 gal (Imp)
34.89 L
310.65 kWh
$2.939
($27.09 total for this fill)
51.81 mpg (US)
62.27 mpg (Imp)
4.54 L/100 km
1.93 gal (US)/100 mi
650.44 Wh/mi
Odo indicated 396.7, with 2.6% correction, that gives 407.0. Using GPS value of 477.6 instead due to intermittent speedo outage.

Continued speedo problems.

Weather was significantly better this tank, and the results clearly show it! Amazing what a little bit of warmer weather can bring!

Still had a few days where I commuted to or from work on the freeway at a relatively high speed, but only had about 1.5% errand miles, which probably helped quite a bit!
2010-03-12 453.8 mi
730.32 km
9.821 gal (US)
8.18 gal (Imp)
37.18 L
330.97 kWh
$2.959
($29.06 total for this fill)
46.21 mpg (US)
55.48 mpg (Imp)
5.09 L/100 km
2.16 gal (US)/100 mi
729.33 Wh/mi
Odo indicated 441.4, with 2.6% correction, that gives 452.6. Using GPS value of 453.8 instead due to intermittent speedo outage.

This tank my speedo started to cut out toward the end intermittently... <grr> More things to track down and fix!

Weather was generally poor and this tank reflects that. Also had a few runs on the freeway at std fwy speeds, which raised my avg mph. Fewer than usual commute miles (~6%) didn't help much.

Looking forward to better summer weather soon!!
2010-03-01 473.5 mi
762.02 km
9.238 gal (US)
7.69 gal (Imp)
34.97 L
311.32 kWh
$2.759
($25.49 total for this fill)
51.26 mpg (US)
61.57 mpg (Imp)
4.59 L/100 km
1.95 gal (US)/100 mi
657.49 Wh/mi
Odo indicated 461.0, with 2.6% correction, that gives 473.0. Using GPS value of 473.5 instead.

Not sure how this tank ended up being so good. A few possible reasons: Weather has improved, with a greater number of warm days. Fewer days of rain. Doing more EOC. Had a couple of longer commute days, when going to the airport and returning; conditions were favorable on those longer commutes (for example, lots of trucks I could draft). Who knows.
2010-02-06 422.2 mi
679.47 km
9.238 gal (US)
7.69 gal (Imp)
34.97 L
311.32 kWh
$2.819
($26.04 total for this fill)
45.7 mpg (US)
54.9 mpg (Imp)
5.15 L/100 km
2.19 gal (US)/100 mi
737.38 Wh/mi
Odo indicated 412.3, with 2.6% correction, that gives 423.0. Using GPS value of 422.2 instead.

Another tank with very little (possibly even no) EOC. Mostly commuting, but much of it during dark hours when I prefer not to EOC.
2010-01-27 421.6 mi
678.5 km
9.709 gal (US)
8.08 gal (Imp)
36.75 L
327.19 kWh
$2.879
($27.95 total for this fill)
43.42 mpg (US)
52.18 mpg (Imp)
5.42 L/100 km
2.3 gal (US)/100 mi
776.07 Wh/mi
Odo indicated 411.7, with 2.6% correction, that gives 422.4. Using GPS value of 421.6 instead.

Once again, very little opportunity for EOC, as indicated by the similarity between GPS miles and corrected Odo miles. Another rough 2 weeks for hypermiling, with combinations of early morning commutes (at relatively high rates of speed) and bad weather.
2010-01-15 448.9 mi
722.43 km
9.198 gal (US)
7.66 gal (Imp)
34.82 L
309.97 kWh
$3.059
($28.14 total for this fill)
48.8 mpg (US)
58.6 mpg (Imp)
4.82 L/100 km
2.05 gal (US)/100 mi
690.51 Wh/mi
Odo indicated 437.8, with 2.6% correction, that gives 449.2. Using GPS value of 448.9 instead.

The tiny difference between the GPS measured and the Odo corrected values indicate how little EOC was done during this tank. Weather was cold and wet, and nearly all morning commutes were done very early in the morning. Had to use AC to clear foggy windows as well as lights. Many mornings also required wipers. Not very good conditions for using EOC methods.
2009-12-31 458.5 mi
737.88 km
10.06 gal (US)
8.38 gal (Imp)
38.08 L
339.02 kWh
$2.859
($28.76 total for this fill)
45.58 mpg (US)
54.71 mpg (Imp)
5.16 L/100 km
2.19 gal (US)/100 mi
739.41 Wh/mi
Odo indicated 442.6, with 2.6% correction, that gives 454.1. Using GPS value of 458.5 instead, due to a little EOC.

Took vacation in the middle of this tank, using a different car, hence the 1 month between fillups. Really waited long to fillup; tank capacity is 10g and fillup amount was just over that, indicating that I must have been just running on fumes! Due to the cold weather and reduced amount of daylight, did not do as much EOC as I typically do in the summers.
2009-11-30 453.7 mi
730.16 km
9.485 gal (US)
7.9 gal (Imp)
35.9 L
319.64 kWh
$2.699
($25.6 total for this fill)
47.83 mpg (US)
57.43 mpg (Imp)
4.92 L/100 km
2.09 gal (US)/100 mi
704.52 Wh/mi
Odo indicated 439.1, with 2.6% correction, that gives 450.5. Using GPS value of 453.7 instead, due to a little EOC.

Relatively high errand to commute % this tank (~18%), much of which was very short distance driving (about a mile or so). This definitely took it's toll. Additionally, had a few occasions where I had to hurry to work, so averaged higher than normal commute speeds.

Replaced the radiator on this tank, as I found a pinhole leak on the inlet hose connector (plastic portion of the radiator), which caused the coolant to get low repeatedly. Definitely don't like running the engine with lower than normal coolant, but now the trouble (with the cooler winter temps) is that the coolant temp rarely rises above even the low mark, especially on commutes to work (which are mostly downhill). Low temps like that probably do not help FE.
2009-11-16 464.5 mi
747.54 km
9.219 gal (US)
7.68 gal (Imp)
34.9 L
310.68 kWh
$2.759
($25.44 total for this fill)
50.39 mpg (US)
60.48 mpg (Imp)
4.67 L/100 km
1.98 gal (US)/100 mi
668.85 Wh/mi
Odo indicated 448.7, with 2.6% correction, that gives 460.4. Using GPS value of 464.5 instead, due to a little EOC.

Fairly typical commute pattern, with about 20% errands (though 18% was one errand mostly on the freeway). Had one long run at over 70mph freeway because I was late, which might have hurt my mileage a bit.

Attempted to clean out the IACV in order to reduce the bouncy idle, but did not help all that much.
2009-11-04 429.3 mi
690.89 km
9.034 gal (US)
7.52 gal (Imp)
34.2 L
304.45 kWh
$2.799
($25.29 total for this fill)
47.52 mpg (US)
57.09 mpg (Imp)
4.95 L/100 km
2.1 gal (US)/100 mi
709.18 Wh/mi
Odo indicated 415.5, with 2.6% correction, that gives 426.3. Using GPS value of 429.3 instead, due to a little EOC.

This tank was a bit challenging; I had a few days where I had to hurry in to work, so average speed was a bit higher than usual, and then I killed the battery one day when I left the lights on all day. The battery never recovered and so there was about a week where I did very little EOC and couldn't shut down the engine during traffic lights. Definitely used up more fuel than usual during that week.
2009-10-18 407.1 mi
655.16 km
8.002 gal (US)
6.66 gal (Imp)
30.29 L
269.67 kWh
$3.039
($24.32 total for this fill)
50.87 mpg (US)
61.13 mpg (Imp)
4.62 L/100 km
1.97 gal (US)/100 mi
662.42 Wh/mi
Odo indicated 390.8, with 2.6% correction, that gives 401.0. Using GPS value of 407.1 instead, due to some EOC.

Had several days where I had to hurry to work, so avg speeds were a bit higher than typical. Also started to have much cooler weather and a few days with rain to deal with.
2009-10-07 489.9 mi
788.42 km
9.185 gal (US)
7.65 gal (Imp)
34.77 L
309.53 kWh
$3.099
($28.46 total for this fill)
53.34 mpg (US)
64.04 mpg (Imp)
4.41 L/100 km
1.87 gal (US)/100 mi
631.82 Wh/mi
Odo indicated 471.0, with 2.6% correction, that gives 483.2. Using GPS value of 489.9 instead, due to a bit of EOC.

Fairly typical commuting this tank. Weather is starting to turn cold. Was really warm for the first week of this tank, and then pretty cool for the 2nd week. About 16% errands this time. A bit higher average speed this tank compared to last due to more freeway commute trips.
2009-09-21 461.3 mi
742.39 km
8.979 gal (US)
7.48 gal (Imp)
33.99 L
302.59 kWh
$3.139
($28.19 total for this fill)
51.38 mpg (US)
61.67 mpg (Imp)
4.58 L/100 km
1.95 gal (US)/100 mi
655.95 Wh/mi
Odo indicated 443.9, with 2.6% correction, that gives 455.4. Using GPS value of 461.3 instead, due to a bit of EOC.

Didn't seem to be a great tank due to more than one day where I had to hurry to work (or back, or just to get somewhere). At the beginning of this tank, upped the pressure on my front tires only to ~50psi (had been keeping them at about 40psi previously). Also removed my rear seats to make room for my tadpole trike, though I doubt the removal of the seats will have any effect... they are really light!

Only about 6% errands vs commuting this tank.
2009-09-10 510.8 mi
822.05 km
9.4 gal (US)
7.83 gal (Imp)
35.58 L
316.78 kWh
$3.119
($29.32 total for this fill)
54.34 mpg (US)
65.24 mpg (Imp)
4.33 L/100 km
1.84 gal (US)/100 mi
620.16 Wh/mi
Odo indicated 489.2, with 2.6% correction, that gives 501.9. Using GPS value of 510.8 instead, due to a lot of EOC.

Woohoo!! Best tank ever! First tank over 500 miles!! It was tough getting as good FE as this on this tank, but I was helped by several very early morning commutes, where I was able to hit nearly every light favorably and coast down to comparatively low speeds when doing EOC. Also had about 1/2 of normal errand running (~6% of total mileage) versus commuting.

Since I had the chance, I filled this tank with high grade at about the same price as mid-grade, still trying to minimize ping.
2009-08-24 442.3 mi
711.81 km
8.592 gal (US)
7.15 gal (Imp)
32.52 L
289.55 kWh
$2.979
($25.6 total for this fill)
51.48 mpg (US)
61.86 mpg (Imp)
4.57 L/100 km
1.94 gal (US)/100 mi
654.65 Wh/mi
Odo indicated 425.9, with 2.6% correction, that gives 437.0. Using GPS value of 442.3 instead, due to some EOC.

Keeping the errand:commuting ratio about the same; this time it was ~15% errands to commuting. Had a couple of days on this tank where I had to hurry to work and therefore was not very conservative; but then tried to make up for it by commuting to work using slower back roads. Will need to hit 55mpg to make up the for the additional distance traveled on those back roads, however.

Went with mid-grade again this tank; seems to help a little with the predetonation.
2009-08-14 469.4 mi
755.43 km
9 gal (US)
7.49 gal (Imp)
34.07 L
303.3 kWh
$3.179
($28.61 total for this fill)
52.16 mpg (US)
62.67 mpg (Imp)
4.51 L/100 km
1.92 gal (US)/100 mi
646.14 Wh/mi
Odo indicated 450.0, with 2.6% correction, that gives 461.7. Using GPS value of 469.4 instead, due to some EOC.

Continued to take the longer route for the home commute. Total round trip used to be about 45.4 miles; with same route going TO work and the longer way coming home, it's now 49.6 miles. Average speeds on the way home are between 33 and 38mph; about 10mph slower than taking the shorter route. Weekly average speed has dropped about 5mph.

Went with the mid-grade fuel this time because of the pinging when lugging the engine on the hills. The mid-grade seems to have helped so far.
2009-08-03 478.8 mi
770.55 km
9.1 gal (US)
7.58 gal (Imp)
34.45 L
306.67 kWh
$2.699
($24.56 total for this fill)
52.62 mpg (US)
63.17 mpg (Imp)
4.47 L/100 km
1.9 gal (US)/100 mi
640.5 Wh/mi
Odo indicated 458.6, with 2.6% correction, that gives 470.5. Using GPS value of 478.8 instead, due to some EOC.

Started taking an alternate route home this tank; it's a bit longer but much slower and less steep overall than the freeway. Hope is that the slower average speed and less steep climbs will boost the fuel mileage significantly.
2009-07-21 417.7 mi
672.22 km
8.278 gal (US)
6.89 gal (Imp)
31.34 L
278.97 kWh
$2.499
($20.69 total for this fill)
50.46 mpg (US)
60.62 mpg (Imp)
4.66 L/100 km
1.98 gal (US)/100 mi
667.87 Wh/mi
Odo indicated 400.5, with 2.6% correction, that gives 410.9. Using GPS value of 417.7 instead, due to some EOC.

Same driving style as typical. Computer systems have been down recently, so have not been able to keep track of details as I normally do. Plan to switch to a different route starting with the new tank, to see if it makes a noticeable difference in FE.
2009-07-02 378 mi
608.33 km
7.925 gal (US)
6.6 gal (Imp)
30 L
267.07 kWh
$2.819
($22.34 total for this fill)
47.7 mpg (US)
57.27 mpg (Imp)
4.93 L/100 km
2.1 gal (US)/100 mi
706.53 Wh/mi
Odo indicated 365.2, with 2.6% correction, that gives 374.7. Using GPS value of 378.0 instead, due to some EOC.

Went on vacation during this tank; drove family to airport with the Maus and then parked there in blazing sun for 2+ weeks; may have lost a little fuel due to evaporation. For comfort of my family, the round trip was driven at a relatively high speed; trip average each way was about 54mph, my highest ever. Round trip distance was nearly 30% of my total miles for this tank; adding the remaining errands brings non-commute miles to 33%.

Weather was cool during first part of tank, then turned hot toward the end, as I finished my tank.
2009-06-04 443.4 mi
713.58 km
8.825 gal (US)
7.35 gal (Imp)
33.41 L
297.4 kWh
$2.599
($22.94 total for this fill)
50.24 mpg (US)
60.33 mpg (Imp)
4.68 L/100 km
1.99 gal (US)/100 mi
670.73 Wh/mi
Odo indicated 424.0, with 2.6% correction, that gives 435.0. Using GPS value of 443.4 instead, due to lots of EOC.

Felt like another good tank, but not quite as good as the last. Probably wasted some fuel (and lowered my FE) by exploring some coast-down areas and doing some simulated runs (hard acceleration). Still only about 14% running errands vs commuting. Didn't really think about it 'til I saw how many miles I got out of this tank, but 500 miles ought to be achievable between fillups now!

Currently, my technique consists primarily of EOC and slower driving. I am averaging about 45mph overall, with very few days above 48mph avg and a few below 38mph avg.

I still have a bouncy idle issue that I haven't resolved. Simply haven't had the time. I'm still using the Cali ECU, even though I have the Fed ECU plus harness ready to go. Too many other things to worry about at the moment. Since I'm getting ~50mpg avg, I'm not too worried about it currently.
2009-05-22 420.7 mi
677.05 km
7.854 gal (US)
6.54 gal (Imp)
29.73 L
264.68 kWh
$2.519
($19.78 total for this fill)
53.57 mpg (US)
64.33 mpg (Imp)
4.39 L/100 km
1.87 gal (US)/100 mi
629.14 Wh/mi
Odo indicated 400.1, with 2.6% correction, that gives 410.5. Using GPS value of 420.7 instead, due to lots of EOC.

A new high!! Had about 14% errands vs the rest commuting. Weather was warmer, typically in the 80s F. Did a lot of EOC throughout this tank, and was able to do more during the commute home due to the sun setting later (I don't like to EOC at night as much because the headlights dim when the engine is off). Lighter weight oil and new plugs, wires, cap & rotor might have helped with this tank too.
2009-05-12 374 mi
601.89 km
7.745 gal (US)
6.45 gal (Imp)
29.32 L
261.01 kWh
$2.269
($17.57 total for this fill)
48.29 mpg (US)
57.98 mpg (Imp)
4.87 L/100 km
2.07 gal (US)/100 mi
697.89 Wh/mi
Odo showed 357.3, with 2.6% correction that is 366.6. Due to lots of EOC, using GPS recorded distance of 374.0 instead.

Still mostly commuting miles, but had a higher percentage of errands for this tank (about 21%). About half way through the tank, changed oil to a lighter weight (to 5W30 vs 10W40), and at the same time installed new cap, rotor, wires, and plugs (but did not index the plugs). Also changed O-rings on the IAT and the IACV, as well as the filter on the IACV. Unfortunately, after all this, I still have a bouncy idle!
2009-05-02 387.4 mi
623.46 km
7.746 gal (US)
6.45 gal (Imp)
29.32 L
261.04 kWh
$2.269
($17.58 total for this fill)
50.01 mpg (US)
60.06 mpg (Imp)
4.7 L/100 km
2 gal (US)/100 mi
673.83 Wh/mi
Odo showed 370.5, with 2.6% correction that is 380.1. Due to lots of EOC, using GPS recorded distance of 387.4 instead.

Mostly commuting during the week with some errands at on the weekends. Weather was pretty good for most of the tank, though had a couple days of rain in the beginning as well as a few during the end of the tank. Right at the end of the tank, started having problems with stalling; tracked this down to a loose ground (my own fault; something I had forgotten to tighten when I removed the Fed ECU and the LAF sensor harness). Once tightened, car ran just fine, but probably wasted some fuel trying to keep it running and restarting it when it died.
2009-04-22 425.8 mi
685.26 km
8.549 gal (US)
7.12 gal (Imp)
32.36 L
288.1 kWh
$2.189
($18.71 total for this fill)
49.81 mpg (US)
59.8 mpg (Imp)
4.72 L/100 km
2.01 gal (US)/100 mi
676.61 Wh/mi
Odo showed 409.2, with 2.6% correction that is 419.8. Due to lots of EOC, using GPS recorded distance of 425.8 instead.

This tank nearly consisted of 100% commuting, with only 2 or 3 errand-related trips. Almost made it 2 weeks between tanks!! Average during commutes speeds have typically been between 45 and 48 mph, a little lower than previous tanks.

A bit of rain during the first few days of the tank, but most of the rest of the tank was during clear and sunny weather, with the past few days actually up in the 80's(F)!
2009-04-09 417.4 mi
671.74 km
9.283 gal (US)
7.73 gal (Imp)
35.14 L
312.84 kWh
$2.219
($20.6 total for this fill)
44.96 mpg (US)
54 mpg (Imp)
5.23 L/100 km
2.22 gal (US)/100 mi
749.5 Wh/mi
Odo showed 406.8; 2.6% adjustment gives 417.4. Oddly, the GPS showed a lower number of miles; only 396.3. In order to be consistent, I used the GPS miles instead of the Odo miles.

This tank was primarily commuting. Due to the problems with the erratic idle after having switched to the Fed ECU, I switched back to the Cali ECU at the beginning of this tank... but still I have the erratic idle!!! Very frustrating. I had hoped to achieve at or near my best FE of 48.8 when I had the Cali ECU, but obviously the FE is nowhere near that. Haven't had any time at all to troubleshoot the high idle. Plan to do an oil change and tune up within the next few weeks, which I hope will quash the idle issues.

Edit: Based on the most recent tank, decided that I must have simply forgotten to bring along GPS during a trip with the car. Using the odometer value + 2.6%, though this will be a little low due to EOC odometer losses.
2009-03-27 415.1 mi
668.04 km
8.794 gal (US)
7.32 gal (Imp)
33.29 L
296.36 kWh
$2.259
($19.87 total for this fill)
47.2 mpg (US)
56.71 mpg (Imp)
4.98 L/100 km
2.12 gal (US)/100 mi
713.95 Wh/mi
Odo showed 405.7; 2.6% adjustment gives 416.2. Did very little EOC on this tank; used the GPS distance of 415.1 instead. Looks like adjustment should be more like 2.3%?

Had a long trip on the 1st half of this tank; no EOC, no P&G, etc. Ran into a lot of traffic, so speeds were low initially, but then picked up to ~65mph later.

The rest of the tank was primarily commuting, but decided to try no EOC (which I do typically)

Haven't had time to trouble-shoot the high idle, so will be swapping back to the Cali ECU (which previously gave me my best tank) until I can spend some time wrenching on the car.
2009-03-20 379.7 mi
611.07 km
7.966 gal (US)
6.63 gal (Imp)
30.15 L
268.45 kWh
$2.199
($17.52 total for this fill)
47.67 mpg (US)
57.27 mpg (Imp)
4.93 L/100 km
2.1 gal (US)/100 mi
707.01 Wh/mi
Odo showed 366.3; 2.6% adjustment gives 375.8, but due to a lot of EOC I used the GPS distance of 379.7 instead (was relatively lazy about turning the key back on in many instances).

Accidentally added premium to the tank this time; will see if that makes any difference (I don't really expect it to).

This tank was nearly all commuting, mostly in fairly good weather (had one instance where it was raining). Had a lot of opportunity to EOC; but still have the high idle issue. Hope to get the extension harness within the next week or so; will need to do further troubleshooting once I have that. Currently have taxes to deal with so weekends for troubleshooting are pretty much shot.
2009-03-10 400 mi
643.74 km
8.365 gal (US)
6.96 gal (Imp)
31.66 L
281.9 kWh
$2.139
($17.89 total for this fill)
47.82 mpg (US)
57.47 mpg (Imp)
4.92 L/100 km
2.09 gal (US)/100 mi
704.75 Wh/mi
Odo showed 388.9; 2.6% adjustment gives 399.0, but due to a lot of EOC I used the GPS distance of 400.0 instead.

Still plagued with high idle, but the replacement Fed ECU (I replaced the 1st Fed ECU with another Fed ECU about 50 miles into this tank) seems to give me better results overall. Have not had a chance to troubleshoot the cause of the high idle very much; simple causes such as vacuum, connections, etc have checked out OK.

This tank was primarily commuting and therefore had a lot of EOC (avoided engine on coast due to the high idle). A few wet & rainy days, but mostly it was cool, dry, and sunny.
2009-02-28 389 mi
626.03 km
8.652 gal (US)
7.2 gal (Imp)
32.75 L
291.57 kWh
$2.259
($19.54 total for this fill)
44.96 mpg (US)
54.03 mpg (Imp)
5.23 L/100 km
2.22 gal (US)/100 mi
749.54 Wh/mi
Odo read 378.4; 2.6% adjustment gave 388.2, but due to lots of EOC, I went with GPS recorded miles of 388.96.

The new Fed ECU is bugging me a lot... whenever I let off the gas to coast in neutral, the idle jumps to about 1500rpm and rarely goes below that... stopping at a light gives me about 1100rpm. Sometimes after a long time it drops to "normal" idle at ~900rpm. I rarely stop the engine when it is night-time or bad weather, so I know the high idle hurt FE. Also spent time trying to diagnose the high idle over the weekend, with lots of idle time, which I'm sure hurt FE further.

This tank was mostly commuting; had a few cold ("California cold") and rainy days. I did quite a bit of EOC when I could (mostly the commute "to" work, which has a lot of downhill) and a few P&G attempts. Definitely could feel the ECU kick into "lean burn" mode and tried to stay within that mode. However, often the lean burn would be so severe that I could not stay at my freeway speed without kicking it back out of lean burn mode.
2009-02-17 310.3 mi
499.38 km
7.05 gal (US)
5.87 gal (Imp)
26.69 L
237.59 kWh
$2.259
($15.93 total for this fill)
44.01 mpg (US)
52.86 mpg (Imp)
5.34 L/100 km
2.27 gal (US)/100 mi
765.68 Wh/mi
Odo indicated 302.4; adjusted by 2.6%

First tank with Fed ECU (except for the first ~50 miles). Miserable weather for nearly all of this tank (rain, cold, snow); often the temp gauge did not indicate above the 1/4 mark. As a result, relatively little EOC and P&G. Also, the swap to Fed ECU either highlighted or caused an issue that results in a very high cold idle and a higher than normal warm idle.
2009-02-06 344.3 mi
554.1 km
7.598 gal (US)
6.33 gal (Imp)
28.76 L
256.05 kWh
$2.079
($15.8 total for this fill)
45.31 mpg (US)
54.39 mpg (Imp)
5.19 L/100 km
2.21 gal (US)/100 mi
743.68 Wh/mi
Odo reading was 335.6; adjusted by 2.6%

Maus was smogged on this tank, so spent at least 1/2 hour idling in the shop waiting for the guys to figure out what was wrong with the smog machine (it kept cutting out). Also discovered that shutting off the key and leaving it off stopped the odometer from registering the miles when I did EOC... so lost some "free" miles on this tank as well.
2009-01-29 390.5 mi
628.45 km
8.197 gal (US)
6.83 gal (Imp)
31.03 L
276.24 kWh
$2.019
($16.55 total for this fill)
47.64 mpg (US)
57.17 mpg (Imp)
4.94 L/100 km
2.1 gal (US)/100 mi
707.4 Wh/mi
Odo reading was 380.6; adjusted by 2.6%

This tank was almost all commuting; one trip to the airport (100 mile RT) and only a couple of side trips. Lots of P&G on this tank; started to doing some EOC as well. Had some cold and rainy days mixed in here as well.

Discovered *after* this tank that odo stops when I turn off the key... probably lost ~10 miles due to that!
2009-01-18 367.1 mi
590.79 km
7.51 gal (US)
6.25 gal (Imp)
28.43 L
253.09 kWh
$2.079
($15.61 total for this fill)
48.88 mpg (US)
58.74 mpg (Imp)
4.81 L/100 km
2.05 gal (US)/100 mi
689.43 Wh/mi
Odo showed 357.8 miles; adjusted up by 2.6% correction factor.

This tank was much more in line with what I expected to get. Mostly commuting, with progressively more P&G throughout. Don't expect to get much better than this without 1) instrumentation, and 2) going to EOC.
2009-01-11 301.7 mi
485.54 km
8.443 gal (US)
7.03 gal (Imp)
31.96 L
284.53 kWh
$2.039
($17.22 total for this fill)
35.73 mpg (US)
42.92 mpg (Imp)
6.58 L/100 km
2.8 gal (US)/100 mi
943.09 Wh/mi
Miles shown on odo: 294.1 Added 2.6% correction according to previous GPS data.

First fillup after I bought the car where I am the driver who burned all the fuel. Very disappointed with this tank. I was hoping that I'd do at least as well as the previous tank (which was mostly driven by the prior owner). Most of this tank was commuting to work and back. Will have to figure out how to improve my driving style to get better FE!!
2008-12-30 341 mi
548.79 km
8.17 gal (US)
6.8 gal (Imp)
30.93 L
275.33 kWh
$1.579
($12.9 total for this fill)
41.74 mpg (US)
50.15 mpg (Imp)
5.64 L/100 km
2.4 gal (US)/100 mi
807.42 Wh/mi
Very first refill, assume that the trip odo was reset by previous owner at the first fillup; previous owner drove at least half the tank.

Edit: Adjusted miles due to odo error; Odo showed 332.4 but GPS indicated odo is low by 2.6%. Not surprising given that the prior owner installed taller than stock tires (175/70R13 vs the stock 165/70R13)

View: spreadsheet friendly fuel log output (for copy/paste)


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