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Fuel log graph
Efficiency log for: Subie - 1996 Subaru Impreza Outback
  • Lifetime Fuel Economy: 23.6 mpg (US), 10 L/100 km, 28.4 mpg (Imp)
  • 90-day Fuel Economy: 21.2 mpg (US), 11.1 L/100 km, 25.4 mpg (Imp)
  • 3-tank Fuel Economy: 21.2 mpg (US), 11.1 L/100 km, 25.4 mpg (Imp)
  • EPA Combined Rating / % over rating: 22 mpg (US) / -3.9% (based on 90-day fuel economy)
  • Total fills: 26
  • Average cost per gal/L: $2.17 per gal (US); $0.00 per L (price data entered for 26 fill/s)
  • Average cost per fill: $24.88
  • Average distance cost: $0.09 per mi. / $0.06 per km
  • Total fuel used: 298.05 gal (US), 1128.3 L
  • Total distance traveled: 7041.4 mi. / 11332.1 km
  • Total cost: $646.86
  • Total fuel saved vs. EPA: 22 gal. (US) / 83.3 L
  • Total saved: $47.74 (based on avg. cost per gal./L)
  • Average tank distance: 270.8 mi. / 435.8 km
Fill date Distance Fill amount Price Fuel Economy Details
2009-12-23 233.3 mi
375.46 km
11.66 gal (US)
9.71 gal (Imp)
44.14 L
392.94 kWh
$2.53
($29.5 total for this fill)
20.01 mpg (US)
24.03 mpg (Imp)
11.76 L/100 km
5 gal (US)/100 mi
1684.27 Wh/mi
Marathon fillup RS 2.5 Intake resonator installed to quiet things down a little bit. Sounds better with the daily driver being very quiet now. Still cold with defrost usage as well.
2009-12-09 253.4 mi
407.81 km
12.26 gal (US)
10.21 gal (Imp)
46.41 L
413.16 kWh
$2.57
($31.51 total for this fill)
20.67 mpg (US)
24.82 mpg (Imp)
11.38 L/100 km
4.84 gal (US)/100 mi
1630.47 Wh/mi
Cold. Marathon 87 fillup. Car had check engine light. I believe it can occasionally flood on startup from a short stop? Leaky injectors? Either way the car needs some service overall. Bad front cam and crank seals, will do oil pump seals at same time.
2009-11-16 266.8 mi
429.37 km
11.71 gal (US)
9.75 gal (Imp)
44.33 L
394.63 kWh
$2.6
($30.45 total for this fill)
22.78 mpg (US)
27.36 mpg (Imp)
10.32 L/100 km
4.39 gal (US)/100 mi
1479.12 Wh/mi
Meijer 87 octane. Temps have dropped, daytime shortened. Finally got the car back on the road! Still burning oil though. That will be next task. Then more maintenance, then small/free additions to help the performance and mostly mileage.
2009-08-13 269.5 mi
433.72 km
11.5 gal (US)
9.58 gal (Imp)
43.53 L
387.55 kWh
$2.52
($28.98 total for this fill)
23.43 mpg (US)
28.13 mpg (Imp)
10.04 L/100 km
4.27 gal (US)/100 mi
1438.03 Wh/mi
Meijer 87 octane fill
2009-07-27 313.8 mi
505.01 km
12.91 gal (US)
10.75 gal (Imp)
48.87 L
435.07 kWh
$2.5
($32.28 total for this fill)
24.31 mpg (US)
29.19 mpg (Imp)
9.68 L/100 km
4.11 gal (US)/100 mi
1386.46 Wh/mi
Marathon Fill up. Normal mixed driving. One or two 30 mile highways. Heavy foot due to RS intake box and no silencer still. I will get used to it some day
2009-07-06 291 mi
468.32 km
12.06 gal (US)
10.04 gal (Imp)
45.65 L
406.42 kWh
$2.569
($30.98 total for this fill)
24.13 mpg (US)
28.98 mpg (Imp)
9.75 L/100 km
4.14 gal (US)/100 mi
1396.63 Wh/mi
- Normal location 87 Marathon - No changes
2009-06-21 256.3 mi
412.47 km
10.39 gal (US)
8.65 gal (Imp)
39.33 L
350.14 kWh
$2.799
($29.08 total for this fill)
24.67 mpg (US)
29.63 mpg (Imp)
9.54 L/100 km
4.05 gal (US)/100 mi
1366.13 Wh/mi
87 Oct Meijer

Installed 2000 RS Intake Box (top and bottom) about 3/4 tank through. Stock resonator was removed. The diameter of intake into the fender wall is much bigger now Makes pushing pedal more fun due to more grumble of course...

At the initial startup of this new tank of fuel, the car threw a code. Most likely a dirty MAF if i have to guess. We shall see soon.

The engine oil leak has slowed considerably due to auto-rx i believe. The transmission now has a small amount in it in anticipation of a flush and fill.
2009-05-11 309 mi
497.29 km
12.02 gal (US)
10.01 gal (Imp)
45.5 L
405.07 kWh
$2.399
($28.84 total for this fill)
25.71 mpg (US)
30.87 mpg (Imp)
9.15 L/100 km
3.89 gal (US)/100 mi
1310.91 Wh/mi
87 Octane Normal Marathon Station

Last of Road Trip MPG numbers - some 10w-40 to help with leak. Oil change to 10w-30 max life and start auto-rx rinse phase soon.
2009-05-08 290 mi
466.71 km
10.94 gal (US)
9.11 gal (Imp)
41.41 L
368.68 kWh
$2.05
($22.43 total for this fill)
26.51 mpg (US)
31.83 mpg (Imp)
8.87 L/100 km
3.77 gal (US)/100 mi
1271.31 Wh/mi
87 octane - shell - Goodlettsville
2009-05-08 266 mi
428.09 km
9.953 gal (US)
8.29 gal (Imp)
37.68 L
335.42 kWh
$2.299
($22.88 total for this fill)
26.73 mpg (US)
32.09 mpg (Imp)
8.8 L/100 km
3.74 gal (US)/100 mi
1260.98 Wh/mi
87 octane - texaco - Atlanta
2009-05-08 303 mi
487.63 km
11.98 gal (US)
9.98 gal (Imp)
45.35 L
403.73 kWh
$2.259
($27.06 total for this fill)
25.29 mpg (US)
30.36 mpg (Imp)
9.3 L/100 km
3.95 gal (US)/100 mi
1332.44 Wh/mi
87 octane - Chevron - Highway
2009-05-08 320 mi
514.99 km
12.45 gal (US)
10.37 gal (Imp)
47.13 L
419.57 kWh
$2.199
($27.38 total for this fill)
25.7 mpg (US)
30.86 mpg (Imp)
9.15 L/100 km
3.89 gal (US)/100 mi
1311.16 Wh/mi
87 octane - ft myers shell - Mixed Driving
2009-05-02 284 mi
457.05 km
10.36 gal (US)
8.63 gal (Imp)
39.22 L
349.13 kWh
$2.119
($21.95 total for this fill)
27.41 mpg (US)
32.91 mpg (Imp)
8.58 L/100 km
3.65 gal (US)/100 mi
1229.33 Wh/mi
87 octane Shell - florida
2009-05-02 253.2 mi
407.49 km
9.617 gal (US)
8.01 gal (Imp)
36.4 L
324.09 kWh
$1.839
($17.69 total for this fill)
26.33 mpg (US)
31.61 mpg (Imp)
8.93 L/100 km
3.8 gal (US)/100 mi
1279.98 Wh/mi
87 octane - big foot/shell? - Valdosta GA
2009-05-01 277.5 mi
446.59 km
10.12 gal (US)
8.43 gal (Imp)
38.31 L
341.04 kWh
$1.879
($19.02 total for this fill)
27.42 mpg (US)
32.92 mpg (Imp)
8.58 L/100 km
3.65 gal (US)/100 mi
1228.97 Wh/mi
87 Octane - Shell - Marietta
2009-05-01 276 mi
444.18 km
9.574 gal (US)
7.97 gal (Imp)
36.24 L
322.64 kWh
$1.949
($18.66 total for this fill)
28.83 mpg (US)
34.63 mpg (Imp)
8.16 L/100 km
3.47 gal (US)/100 mi
1168.99 Wh/mi
87 Octane - BP - Kentucky

- 11:29 am
2009-04-30 258 mi
415.21 km
10.84 gal (US)
9.03 gal (Imp)
41.03 L
365.31 kWh
$2.05
($22.22 total for this fill)
23.8 mpg (US)
28.57 mpg (Imp)
9.88 L/100 km
4.2 gal (US)/100 mi
1415.93 Wh/mi
87 Octane Meijer - First Fillup before auto-rx treatment

7:45
2009-04-24 282 mi
453.84 km
12.1 gal (US)
10.07 gal (Imp)
45.8 L
407.77 kWh
$2.099
($25.4 total for this fill)
23.31 mpg (US)
28 mpg (Imp)
10.09 L/100 km
4.29 gal (US)/100 mi
1445.99 Wh/mi
04-14 Fill up with 87 octane Speedway fuel - 12.755 Gallons

Marathon Fillup - Normal Location

No Changes
2009-04-05 286.7 mi
461.4 km
12.54 gal (US)
10.44 gal (Imp)
47.47 L
422.6 kWh
$1.899
($23.81 total for this fill)
22.86 mpg (US)
27.46 mpg (Imp)
10.29 L/100 km
4.37 gal (US)/100 mi
1474.01 Wh/mi
Fill with 87 Marathon Normal Location.

Transmission fluid changed after fill up on 04-05-09.
2009-03-26 286.8 mi
461.56 km
12.12 gal (US)
10.09 gal (Imp)
45.88 L
408.44 kWh
$2.099
($25.44 total for this fill)
23.66 mpg (US)
28.42 mpg (Imp)
9.94 L/100 km
4.23 gal (US)/100 mi
1424.13 Wh/mi
Filled with 87 Octane from Petro Truck Stop

Bigger wheels in diameter and tread width put on. Should actually be a negative affect on mileage. But, more accurate distance numbers due to GPS reading say stock speedo is off.
2009-03-03 266.3 mi
428.57 km
11.65 gal (US)
9.7 gal (Imp)
44.1 L
392.61 kWh
$1.859
($21.66 total for this fill)
22.86 mpg (US)
27.45 mpg (Imp)
10.29 L/100 km
4.37 gal (US)/100 mi
1474.31 Wh/mi
87 Octane Shell in Eastern Indiana

at least 130 miles on interstate

Still no mods.
Oil change, wheel change, front cheap lip, roof rack cross bar removal all soon.
2009-02-25 225.7 mi
363.23 km
10.17 gal (US)
8.47 gal (Imp)
38.5 L
342.73 kWh
$1.729
($17.58 total for this fill)
22.19 mpg (US)
26.65 mpg (Imp)
10.6 L/100 km
4.51 gal (US)/100 mi
1518.52 Wh/mi
Marathon 87 - Normal Location

This stint was done with 1/3 bottle of heet as noted below.

120 miles highway driving at 75 mph. Some more spirited driving than normal.

No changes to car yet.
2009-02-21 293.8 mi
472.83 km
12.83 gal (US)
10.68 gal (Imp)
48.57 L
432.37 kWh
$1.799
($23.08 total for this fill)
22.9 mpg (US)
27.51 mpg (Imp)
10.27 L/100 km
4.37 gal (US)/100 mi
1471.65 Wh/mi
Normal Marathon 87 Fillup with 1/3 bottle of Heet.

Replaced Ignition Coil showed large improvement in Mileage.

Some interstate Travel.
2009-02-12 226.6 mi
364.68 km
12.27 gal (US)
10.22 gal (Imp)
46.45 L
413.5 kWh
$1.959
($24.04 total for this fill)
18.47 mpg (US)
22.17 mpg (Imp)
12.74 L/100 km
5.41 gal (US)/100 mi
1824.8 Wh/mi
87 Octane Marathon -carmel

1st quarter + tank consumed by misfire in cylinder 3 traced back to a bad ignition coil. Terribly large amount of snow storms!
2009-01-30 214.7 mi
345.53 km
11.47 gal (US)
9.55 gal (Imp)
43.42 L
386.54 kWh
$1.729
($19.83 total for this fill)
18.72 mpg (US)
22.48 mpg (Imp)
12.57 L/100 km
5.34 gal (US)/100 mi
1800.37 Wh/mi
Normal Marathon location fillup.

Very cold temps. Lots of snow. Just city driving.
2009-01-16 238 mi
383.02 km
12.56 gal (US)
10.46 gal (Imp)
47.54 L
423.27 kWh
$1.999
($25.11 total for this fill)
18.95 mpg (US)
22.75 mpg (Imp)
12.41 L/100 km
5.28 gal (US)/100 mi
1778.45 Wh/mi
Filled with 87 Marathon - 38th st

I am not sure if this is accurate as it is the trip odometer mileage from previous owner, but i reckon it may be close.

The journey starts with improving the car to my liking while improving mileage as well to make the car as a suitable long travel vehicle and fun vehicle.

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


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