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Fuel log graph
Efficiency log for: Merica's Frankenstein - 1990 Honda CRX HF
  • Lifetime Fuel Economy: 43.3 mpg (US), 5.4 L/100 km, 52 mpg (Imp)
  • 90-day Fuel Economy: 47.4 mpg (US), 5 L/100 km, 56.9 mpg (Imp)
  • 3-tank Fuel Economy: 49.6 mpg (US), 4.7 L/100 km, 59.6 mpg (Imp)
  • EPA Combined Rating / % over rating: 43 mpg (US) / 10.2% (based on 90-day fuel economy)
  • Total fills: 50
  • Average cost per gal/L: $3.62 per gal (US); $0.00 per L (price data entered for 50 fill/s)
  • Average cost per fill: $22.47
  • Average distance cost: $0.08 per mi. / $0.05 per km
  • Total fuel used: 310.31 gal (US), 1174.7 L
  • Total distance traveled: 13446.7 mi. / 21640.3 km
  • Total cost: $1,123.45
  • Total fuel saved vs. EPA: 2.4 gal. (US) / 9.1 L
  • Total saved: $8.69 (based on avg. cost per gal./L)
  • Average tank distance: 268.9 mi. / 432.8 km
Fill date Distance Fill amount Price Fuel Economy Details
2022-08-17 239 mi
384.63 km
4.508 gal (US)
3.75 gal (Imp)
17.06 L
151.92 kWh
$3.17
($14.29 total for this fill)
53.02 mpg (US)
63.73 mpg (Imp)
4.44 L/100 km
1.89 gal (US)/100 mi
635.65 Wh/mi
Rotated tires and aired them all back up to 39, they were down at 33
2022-08-13 231.8 mi
373.05 km
5.295 gal (US)
4.41 gal (Imp)
20.04 L
178.44 kWh
$3.25
($17.21 total for this fill)
43.78 mpg (US)
52.56 mpg (Imp)
5.37 L/100 km
2.28 gal (US)/100 mi
769.8 Wh/mi
2022-08-11 230.2 mi
370.47 km
4.33 gal (US)
3.61 gal (Imp)
16.39 L
145.92 kWh
$3.27
($14.16 total for this fill)
53.16 mpg (US)
63.77 mpg (Imp)
4.42 L/100 km
1.88 gal (US)/100 mi
633.88 Wh/mi
2022-08-06 248.6 mi
400.08 km
5.325 gal (US)
4.43 gal (Imp)
20.16 L
179.45 kWh
$3.43
($18.26 total for this fill)
46.69 mpg (US)
56.12 mpg (Imp)
5.04 L/100 km
2.14 gal (US)/100 mi
721.84 Wh/mi
2022-08-03 205.2 mi
330.24 km
4.356 gal (US)
3.63 gal (Imp)
16.49 L
146.8 kWh
$3.35
($14.59 total for this fill)
47.11 mpg (US)
56.53 mpg (Imp)
4.99 L/100 km
2.12 gal (US)/100 mi
715.4 Wh/mi
2022-07-30 227.4 mi
365.96 km
4.483 gal (US)
3.73 gal (Imp)
16.97 L
151.08 kWh
$3.52
($15.78 total for this fill)
50.72 mpg (US)
60.97 mpg (Imp)
4.64 L/100 km
1.97 gal (US)/100 mi
664.38 Wh/mi
2022-07-28 212.8 mi
342.47 km
4.239 gal (US)
3.53 gal (Imp)
16.05 L
142.85 kWh
$3.41
($14.45 total for this fill)
50.2 mpg (US)
60.28 mpg (Imp)
4.69 L/100 km
1.99 gal (US)/100 mi
671.29 Wh/mi
2022-07-24 244 mi
392.68 km
4.651 gal (US)
3.87 gal (Imp)
17.61 L
156.74 kWh
$3.5
($16.28 total for this fill)
52.46 mpg (US)
63.05 mpg (Imp)
4.48 L/100 km
1.91 gal (US)/100 mi
642.38 Wh/mi
Been doing more longer distance highway and interstate predominate drives lately
2022-07-21 237.9 mi
382.86 km
5.471 gal (US)
4.56 gal (Imp)
20.71 L
184.37 kWh
$3.6
($19.7 total for this fill)
43.48 mpg (US)
52.17 mpg (Imp)
5.41 L/100 km
2.3 gal (US)/100 mi
774.99 Wh/mi
2022-07-16 258 mi
415.21 km
4.438 gal (US)
3.7 gal (Imp)
16.8 L
149.56 kWh
$3.69
($16.38 total for this fill)
58.13 mpg (US)
69.73 mpg (Imp)
4.05 L/100 km
1.72 gal (US)/100 mi
579.69 Wh/mi
Just like my last really good tank, this one was mostly interstate and highway travel.

My vacuum gauge has colored zones to indicate good and poor eco so my tactic has been to not allow myself to press the accelerator enough to leave the green zone as much as possible, even when accelerating. If I have to accelerate more my second self limit point is 10 on the vacuum gauge, then if that isn't enough I try to just never go past 5 in the red zone. I also attempt to shift as soon as the car will let me which is generally every 10mph increase. so 10mph go to 2nd, 20mph go to 3rd, etc. I also try to not leave the green when going uphill allowing myself to decelerate as long as I'm not holding up traffic and using the downhill to reaccelerate. I also try to engine off coast when possible and ride 18wheeler slip steams at a safe distance. Overall the general trend seems to be my mpg has been on the rise with these tactics, but I can't do them as much in heavy traffic, or long steep hills. Long hills Idk what to do yet since I can't use my initial inertia to get me most the way up them I try to stay in as high of a gear as possible and press all the way down to the red power zone just about 5 on the vacuum gauge. I have no idea if this is a good option or not however. Honestly not 100% about anything I am doing, just doing what feels right and recording things here.
2022-07-13 234.6 mi
377.55 km
6.122 gal (US)
5.1 gal (Imp)
23.17 L
206.31 kWh
$3.77
($23.08 total for this fill)
38.32 mpg (US)
46 mpg (Imp)
6.14 L/100 km
2.61 gal (US)/100 mi
879.41 Wh/mi
I think tank being so low mpg was mostly cause it was short distance drives only and I had covid so I probably wasn't as focused as I could have been. No worries though I wasn't going to public places with people, that's why it was all super short distance drives. Visiting family who also had covid at the same time as me. Was certainly a surprise cause my gas needle was right on half a tank which should have been like 5 gallons not over 6.
2022-07-05 202.3 mi
325.57 km
4.299 gal (US)
3.58 gal (Imp)
16.27 L
144.88 kWh
$4.06
($17.45 total for this fill)
47.06 mpg (US)
56.51 mpg (Imp)
5 L/100 km
2.13 gal (US)/100 mi
716.16 Wh/mi
2022-07-03 299 mi
481.19 km
6.141 gal (US)
5.11 gal (Imp)
23.25 L
206.95 kWh
$4.06
($24.93 total for this fill)
48.69 mpg (US)
58.51 mpg (Imp)
4.83 L/100 km
2.05 gal (US)/100 mi
692.14 Wh/mi
I have a feeling this tank would have had higher MPG if I hadn't had my brake booster go out on me near the end causing my car to idle at 2k rpm.
2022-06-28 254.4 mi
409.42 km
5.791 gal (US)
4.82 gal (Imp)
21.92 L
195.16 kWh
$4.13
($23.92 total for this fill)
43.93 mpg (US)
52.78 mpg (Imp)
5.35 L/100 km
2.28 gal (US)/100 mi
767.14 Wh/mi
The jump battery definately works for keeping the battery alive while engine off coasting at night. My low results here are more from driving in busy traffic though, I tend to accelerate twice as fast when surrounded by heavy traffic which is still slower than everyone else though
2022-06-26 269.7 mi
434.04 km
5.426 gal (US)
4.52 gal (Imp)
20.54 L
182.86 kWh
$4.11
($22.3 total for this fill)
49.71 mpg (US)
59.67 mpg (Imp)
4.73 L/100 km
2.01 gal (US)/100 mi
678.01 Wh/mi
Been experimenting with engine off coasting but was having issues at night with the battery getting too low. Most people seem to go with a deepcycle battery for this reason but I went the opposite direction getting a 12 pound cheap amazon $70 agm battery that's meant as a secondary battery to supplement sound systems. I chose that battery cause A $100 cheaper than the normal battery and B much lighter than the normal battery. Now the battery does have the drawback of having only half the capacity of the stock battery so it dies faster, but it also charges faster. Had the idea tonight just before I got gas to supplement that battery using my jumpstart battery. My jumpstart battery is wired up to my car battery at all times already. It only weighs about 3 pounds I think, I just always had it in the car to begin with in case I needed it so all I am doing now is just when I cut the engine, I lean over and hit the jumpstart button and it kicks on and keeps my battery charged. Boom, solves the engine off coasting issues with the lightweight battery so deep cycle isn't necessary. I charge it off a cig lighter plug so I'll charge it during the day and use it at night. I'll update how it goes on the next fill up
2022-06-20 315.8 mi
508.23 km
6.398 gal (US)
5.33 gal (Imp)
24.22 L
215.61 kWh
$4.17
($26.68 total for this fill)
49.36 mpg (US)
59.25 mpg (Imp)
4.77 L/100 km
2.03 gal (US)/100 mi
682.74 Wh/mi
2022-06-16 309.6 mi
498.25 km
6.73 gal (US)
5.6 gal (Imp)
25.48 L
226.8 kWh
$4.21
($28.33 total for this fill)
46 mpg (US)
55.29 mpg (Imp)
5.11 L/100 km
2.17 gal (US)/100 mi
732.56 Wh/mi
2022-06-11 363.9 mi
585.64 km
8.066 gal (US)
6.72 gal (Imp)
30.53 L
271.82 kWh
$4.41
($35.57 total for this fill)
45.12 mpg (US)
54.15 mpg (Imp)
5.21 L/100 km
2.22 gal (US)/100 mi
746.96 Wh/mi
2022-06-04 284.1 mi
457.21 km
5.886 gal (US)
4.9 gal (Imp)
22.28 L
198.36 kWh
$4.18
($24.6 total for this fill)
48.27 mpg (US)
57.98 mpg (Imp)
4.87 L/100 km
2.07 gal (US)/100 mi
698.2 Wh/mi
Topped up my manual trans fluid at the start of this tank, I was almost a quart low. Also plugged the hole in my cat fixing the exhaust leak at the same time.
2022-05-31 294.7 mi
474.27 km
6.496 gal (US)
5.41 gal (Imp)
24.59 L
218.92 kWh
$4.12
($26.76 total for this fill)
45.37 mpg (US)
54.47 mpg (Imp)
5.18 L/100 km
2.2 gal (US)/100 mi
742.86 Wh/mi
Plug for the downstream-ish (it's on the universal cat so unsure just how "Downstream" it really is) fell out about half way through this tank so now I have an exhaust leak. Ordered a plug but won't get it for a few more days.
2022-05-29 319 mi
513.38 km
6.686 gal (US)
5.57 gal (Imp)
25.31 L
225.32 kWh
$4.12
($27.55 total for this fill)
47.71 mpg (US)
57.27 mpg (Imp)
4.93 L/100 km
2.1 gal (US)/100 mi
706.33 Wh/mi
No new updates, still driving like normal and trying to keep the check engine light off while driving.
2022-05-26 345.5 mi
556.03 km
7.573 gal (US)
6.31 gal (Imp)
28.67 L
255.21 kWh
$4.01
($30.37 total for this fill)
45.62 mpg (US)
54.75 mpg (Imp)
5.16 L/100 km
2.19 gal (US)/100 mi
738.67 Wh/mi
First tank with the new O2 sensor. Engine is certainly running way smoother and has more usable power. I think I need to possibly change my driving methods since I had modified my habits for the best results with how the engine used to run. New O2 sensor doesn't heat up quick enough to keep the check engine light off so I have to turn the car off and turn it back on once I start getting readings from the O2 sensor and oddly it cools off really fast so even if the engine is off for 5 minutes it won't heat back up till I get moving, in fact it doesn't seem to get hot enough to work even when I'm sitting idle. Need to look into this further. I also notice if I drive with the check engine light on the engine will run rich coasting or idle but lean with any amount of throttle, but with the check engine light off it runs optimally most of the time unless I drop throttle enough for 5 or less on the vacuum gauge then it goes to rich which seems normal.
2022-05-21 318.1 mi
511.93 km
7.036 gal (US)
5.86 gal (Imp)
26.63 L
237.11 kWh
$4.11
($28.92 total for this fill)
45.21 mpg (US)
54.28 mpg (Imp)
5.2 L/100 km
2.21 gal (US)/100 mi
745.39 Wh/mi
This is my last tank with check engine light and old O2 Sensor. Right after I filled up I spent today working on the car, and got a new O2 sensor on. Only been driving a day with it BUT MAN there is a difference. I'm not driving the same car anymore! Check engine light is gone, it's running way smoother, feels more responsive, and is way quieter. I have a good feeling my MPG is going to be substantially better on my next log entry.
2022-05-15 354.65 mi
570.75 km
8.214 gal (US)
6.84 gal (Imp)
31.09 L
276.81 kWh
$4.03
($33.1 total for this fill)
43.18 mpg (US)
51.85 mpg (Imp)
5.45 L/100 km
2.32 gal (US)/100 mi
780.52 Wh/mi
Check engine light is still on so unsure if it's negatively impacting my mpg or not. I can't get my old O2 sensor off still but I am still putting penetrating oil on it every day so hopefully soon it will come off
2022-05-10 305.6 mi
491.82 km
6.558 gal (US)
5.46 gal (Imp)
24.82 L
221 kWh
$4.02
($26.36 total for this fill)
46.6 mpg (US)
55.97 mpg (Imp)
5.05 L/100 km
2.15 gal (US)/100 mi
723.17 Wh/mi
Been trying to get the hang of the Vacuum gauge. Also close to the end of this tank I installed an air/fuel ratio gauge but I have a check engine light on now. I'd be in more of a rush to fix it but surprisingly the smell of gas isn't as strong from my car now so I wonder if it's actually making the car run leaner. Air/fuel gauge shows I'm running pretty lean but I do smell gas still so I'm hoping the o2 sensor is just old and can't put out a strong enough signal for the both the ECU and the Gauge since I'm 99% positive I did the wiring alright. Might try to shorten the cable to the gauge too since I did leave a little extra just in case and it might just be too much. Been trying to replace the o2 sensor but old one is seized on there really tight so I've been spraying penetrating oil on it every day for a few days now. Probably going to run this next tank all the way through with a check engine light on sadly.
2022-05-08 229.3 mi
369.02 km
5.258 gal (US)
4.38 gal (Imp)
19.9 L
177.19 kWh
$3.92
($20.61 total for this fill)
43.61 mpg (US)
52.35 mpg (Imp)
5.39 L/100 km
2.29 gal (US)/100 mi
772.74 Wh/mi
Filled up a little early cause I finally got and installed a Vacuum gauge so hopefully once I learn to read it right my results on here will be even better
2022-05-02 291.3 mi
468.8 km
5.539 gal (US)
4.61 gal (Imp)
20.97 L
186.66 kWh
$3.62
($20.05 total for this fill)
52.59 mpg (US)
63.19 mpg (Imp)
4.47 L/100 km
1.9 gal (US)/100 mi
640.78 Wh/mi
This tank was mostly highway and interstate travel but I started shifting even sooner for this tank, around a full 10mph sooner than I used to before I started doing this, severely cuts into my acceleration however the results are promising
2022-04-29 306 mi
492.46 km
7.323 gal (US)
6.1 gal (Imp)
27.72 L
246.79 kWh
$3.72
($27.24 total for this fill)
41.79 mpg (US)
50.16 mpg (Imp)
5.63 L/100 km
2.39 gal (US)/100 mi
806.5 Wh/mi
Still shifting at low rpms but my driving routes and conditions are never the same so
2022-04-24 314.2 mi
505.66 km
6.554 gal (US)
5.46 gal (Imp)
24.81 L
220.87 kWh
$3.64
($23.86 total for this fill)
47.94 mpg (US)
57.55 mpg (Imp)
4.91 L/100 km
2.09 gal (US)/100 mi
702.96 Wh/mi
Part way into this tank I started shifting earlier since I had a tiny bit more power thanks to correcting the cold air intake tube a week or two ago.

Also my mile tracking is going to be more precise from now on. The log app I was using before couldn't do decimals which is why my logs before joining the site don't contain any decimals in the mileage
2022-04-18 239 mi
384.63 km
5.936 gal (US)
4.94 gal (Imp)
22.47 L
200.04 kWh
$3.51
($20.84 total for this fill)
40.26 mpg (US)
48.38 mpg (Imp)
5.84 L/100 km
2.48 gal (US)/100 mi
836.99 Wh/mi
Added a bottle of Fuel injector cleaner just to see if it'd do anything out of curiosity, and added a cut plastic tub lid to cover half of my grill opening from the inside, since I have a half sized radiator anyways, somehow I got exactly the same MPG again. Keep in mind I do delivery work so the routes I drive are never the same
2022-04-13 289 mi
465.1 km
7.2 gal (US)
5.99 gal (Imp)
27.25 L
242.64 kWh
$3.4
($24.48 total for this fill)
40.14 mpg (US)
48.25 mpg (Imp)
5.86 L/100 km
2.49 gal (US)/100 mi
839.58 Wh/mi
Right before fill up I changed the cold air intake tube to streamline airflow, this made the air flow significantly less turbulent inside the tube cause old one was beyond trash, zig zaggy, and ribbed on the inside greatly. New tube was smooth and straight with only a single slight bend. I felt better throttle response so I know it worked but not sure if my mpg dip was from that, or if I had a heavier foot feeling better throttle response. Car runs rich so I was hoping more air could help but I think the MAP readings are making the ECU compensate for more air and keep it rich.
2022-04-08 301 mi
484.41 km
6.513 gal (US)
5.42 gal (Imp)
24.65 L
219.49 kWh
$3.46
($22.53 total for this fill)
46.22 mpg (US)
55.54 mpg (Imp)
5.09 L/100 km
2.16 gal (US)/100 mi
729.2 Wh/mi
Just did an oil change, installed new spark plugs, aired tires to 40psi, topped up transmission fluid, cleaned air filter, changed fuel filter, etc. Before this tank so good mpg results. Keep in mind this is with the car running so rich it failed emissions testing. Car also has a high idle.
2022-04-01 272 mi
437.74 km
7.416 gal (US)
6.17 gal (Imp)
28.07 L
249.92 kWh
$3.71
($27.51 total for this fill)
36.68 mpg (US)
44.08 mpg (Imp)
6.41 L/100 km
2.73 gal (US)/100 mi
918.82 Wh/mi
2022-03-27 218 mi
350.84 km
4.891 gal (US)
4.07 gal (Imp)
18.51 L
164.83 kWh
$3.79
($18.54 total for this fill)
44.57 mpg (US)
53.56 mpg (Imp)
5.28 L/100 km
2.24 gal (US)/100 mi
756.1 Wh/mi
2022-03-25 280 mi
450.62 km
7.171 gal (US)
5.97 gal (Imp)
27.15 L
241.66 kWh
$3.72
($26.68 total for this fill)
39.05 mpg (US)
46.9 mpg (Imp)
6.03 L/100 km
2.56 gal (US)/100 mi
863.07 Wh/mi
2022-03-19 304 mi
489.24 km
7.749 gal (US)
6.45 gal (Imp)
29.33 L
261.14 kWh
$3.7
($28.67 total for this fill)
39.23 mpg (US)
47.13 mpg (Imp)
6 L/100 km
2.55 gal (US)/100 mi
859.01 Wh/mi
2022-03-14 245 mi
394.29 km
6.889 gal (US)
5.74 gal (Imp)
26.08 L
232.16 kWh
$3.81
($26.25 total for this fill)
35.56 mpg (US)
42.68 mpg (Imp)
6.61 L/100 km
2.81 gal (US)/100 mi
947.59 Wh/mi
This was my results of the 100% gas

No idea if driving conditions or if the gas I got last time was crap, it wasn't one of the usual two stations I try to stick with
2022-03-11 224 mi
360.49 km
5.044 gal (US)
4.2 gal (Imp)
19.09 L
169.98 kWh
$3.93
($19.82 total for this fill)
44.41 mpg (US)
53.33 mpg (Imp)
5.3 L/100 km
2.25 gal (US)/100 mi
758.84 Wh/mi
Filled up this time with 100% Gas
2022-03-06 305 mi
490.85 km
7.605 gal (US)
6.33 gal (Imp)
28.79 L
256.29 kWh
$3.79
($28.82 total for this fill)
40.11 mpg (US)
48.18 mpg (Imp)
5.87 L/100 km
2.49 gal (US)/100 mi
840.3 Wh/mi
2022-03-02 223 mi
358.88 km
6.853 gal (US)
5.71 gal (Imp)
25.94 L
230.95 kWh
$3.14
($21.52 total for this fill)
32.54 mpg (US)
39.05 mpg (Imp)
7.23 L/100 km
3.07 gal (US)/100 mi
1035.65 Wh/mi
2022-02-26 260 mi
418.43 km
6.706 gal (US)
5.58 gal (Imp)
25.38 L
225.99 kWh
$3.2
($21.46 total for this fill)
38.77 mpg (US)
46.59 mpg (Imp)
6.07 L/100 km
2.58 gal (US)/100 mi
869.19 Wh/mi
2022-02-18 241 mi
387.85 km
5.983 gal (US)
4.98 gal (Imp)
22.65 L
201.63 kWh
$3.15
($18.85 total for this fill)
40.28 mpg (US)
48.39 mpg (Imp)
5.84 L/100 km
2.48 gal (US)/100 mi
836.64 Wh/mi
2022-02-14 260 mi
418.43 km
6.6 gal (US)
5.49 gal (Imp)
24.98 L
222.42 kWh
$3.12
($20.59 total for this fill)
39.39 mpg (US)
47.36 mpg (Imp)
5.97 L/100 km
2.54 gal (US)/100 mi
855.46 Wh/mi
2022-02-10 273 mi
439.35 km
6.638 gal (US)
5.53 gal (Imp)
25.13 L
223.7 kWh
$3.23
($21.44 total for this fill)
41.13 mpg (US)
49.37 mpg (Imp)
5.72 L/100 km
2.43 gal (US)/100 mi
819.41 Wh/mi
2022-02-03 303 mi
487.63 km
8.406 gal (US)
7 gal (Imp)
31.82 L
283.28 kWh
$2.84
($23.87 total for this fill)
36.05 mpg (US)
43.29 mpg (Imp)
6.53 L/100 km
2.77 gal (US)/100 mi
934.92 Wh/mi
2022-01-28 287 mi
461.88 km
7.38 gal (US)
6.15 gal (Imp)
27.94 L
248.71 kWh
$3.09
($22.8 total for this fill)
38.89 mpg (US)
46.67 mpg (Imp)
6.05 L/100 km
2.57 gal (US)/100 mi
866.59 Wh/mi
2022-01-21 247 mi
397.51 km
5.603 gal (US)
4.67 gal (Imp)
21.21 L
188.82 kWh
$2.82
($15.8 total for this fill)
44.08 mpg (US)
52.89 mpg (Imp)
5.34 L/100 km
2.27 gal (US)/100 mi
764.45 Wh/mi
2022-01-15 279 mi
449.01 km
8.099 gal (US)
6.74 gal (Imp)
30.66 L
272.94 kWh
$2.89
($23.41 total for this fill)
34.45 mpg (US)
41.39 mpg (Imp)
6.83 L/100 km
2.9 gal (US)/100 mi
978.28 Wh/mi
2022-01-08 218 mi
350.84 km
6.48 gal (US)
5.4 gal (Imp)
24.53 L
218.38 kWh
$3.13
($20.28 total for this fill)
33.64 mpg (US)
40.37 mpg (Imp)
6.99 L/100 km
2.97 gal (US)/100 mi
1001.74 Wh/mi
2022-01-05 232 mi
373.37 km
5.959 gal (US)
4.96 gal (Imp)
22.56 L
200.82 kWh
$2.77
($16.51 total for this fill)
38.93 mpg (US)
46.77 mpg (Imp)
6.04 L/100 km
2.57 gal (US)/100 mi
865.6 Wh/mi
I use the app gas buddy and have their gas card so I've been keeping a gas log for awhile on that (unfortunately it wont let me enter decimals on the mileage so these numbers are slightly off by a little bit) but decided to go ahead and type it all in back to the beginning of the year to keep track of this year as a whole on here

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


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