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Fuel log graph
Efficiency log for: Sub - 1984 Chevy Diesel Suburban C10
  • Lifetime Fuel Economy: 19.4 mpg (US), 12.2 L/100 km, 23.2 mpg (Imp)
  • 90-day Fuel Economy: 19.5 mpg (US), 12.1 L/100 km, 23.4 mpg (Imp)
  • 3-tank Fuel Economy: 19.5 mpg (US), 12 L/100 km, 23.5 mpg (Imp)
  • EPA Combined Rating / % over rating: 17 mpg (US) / 14.7% (based on 90-day fuel economy)
  • Total fills: 31
  • Average cost per gal/L: $3.78 per gal (US); $0.00 per L (price data entered for 29 fill/s)
  • Average cost per fill: $51.11
  • Average distance cost: $0.20 per mi. / $0.12 per km
  • Total fuel used: 410.31 gal (US), 1553.2 L
  • Total distance traveled: 7941 mi. / 12779.8 km
  • Total cost: $1,482.18
  • Total fuel saved vs. EPA: 56.8 gal. (US) / 215 L
  • Total saved: $214.7 (based on avg. cost per gal./L)
  • Average tank distance: 256.2 mi. / 412.3 km
Fill date Distance Fill amount Price Fuel Economy Details
2013-11-04 211 mi
339.57 km
12.67 gal (US)
10.55 gal (Imp)
47.96 L
426.98 kWh
($46.12 total for this fill)
16.65 mpg (US)
20 mpg (Imp)
14.12 L/100 km
6 gal (US)/100 mi
2023.6 Wh/mi
Mix of in town and highway driving plus its getting cold.
Plus leaking return line.
New transmissions coolers I added this summer are causing the transmission to run cold.
2013-09-10 418 mi
672.71 km
20.8 gal (US)
17.32 gal (Imp)
78.74 L
700.96 kWh
($82.78 total for this fill)
20.1 mpg (US)
24.13 mpg (Imp)
11.7 L/100 km
4.98 gal (US)/100 mi
1676.94 Wh/mi
Mostly highway driving, had real bad cross winds for about 200 miles.
Kept it under 70 almost all the time.
Carrying about 400 pounds of tools and spare tire, also did a move.
Pulled the trailer for about 20 miles loaded down with 860lb of steel.
Need to pull all the tools out.
Full at 900
2013-09-08 332 mi
534.3 km
15.7 gal (US)
13.07 gal (Imp)
59.43 L
529.09 kWh
($61.23 total for this fill)
21.15 mpg (US)
25.4 mpg (Imp)
11.12 L/100 km
4.73 gal (US)/100 mi
1593.64 Wh/mi
All highway driving, kept it at or under 65mph most of the time.
Loaded with all tool boxes and 2 dogs.
Did have some cross winds for this drive.
full at 494
2013-08-15 84 mi
135.18 km
3.98 gal (US)
3.31 gal (Imp)
15.07 L
134.13 kWh
($14.53 total for this fill)
21.11 mpg (US)
25.38 mpg (Imp)
11.15 L/100 km
4.74 gal (US)/100 mi
1596.79 Wh/mi
The thin air part of the drive, plainview to clovis.
Kept it under 70mph drove it easy.
I should have got better fuel mileage this tank than the last one, drove slower and had less cross winds, must be the thinner air.
2013-08-15 172 mi
276.81 km
8 gal (US)
6.66 gal (Imp)
30.28 L
269.6 kWh
($29.28 total for this fill)
21.5 mpg (US)
25.83 mpg (Imp)
10.94 L/100 km
4.65 gal (US)/100 mi
1567.44 Wh/mi
Going up hill from witchatawfalls Tx.
Medium cross winds, kept it under 70mph drove it easy, loaded down with tools and dogs.
No trailer.
2013-08-09 290 mi
466.71 km
16.15 gal (US)
13.45 gal (Imp)
61.13 L
544.26 kWh
($59.11 total for this fill)
17.96 mpg (US)
21.56 mpg (Imp)
13.1 L/100 km
5.57 gal (US)/100 mi
1876.76 Wh/mi
Testing out my new air dam. Drove it hard down hill on my standard 6hr drive.
Speeds on the highway trips were as high as 90mph with plenty of time at 75+, trying to break in the air dam.
About 30 of those 290 miles were driven in town.
Had a good cross wind going the entire way.
Noticed with the air dam the front end is less twitchy in cross winds. At 65mph the truck was trying to run about 5 degrees cooler.
Running 5psi of boost or more the whole way.
2013-06-27 126 mi
202.78 km
6.22 gal (US)
5.18 gal (Imp)
23.55 L
209.61 kWh
($23.57 total for this fill)
20.26 mpg (US)
24.32 mpg (Imp)
11.61 L/100 km
4.94 gal (US)/100 mi
1663.57 Wh/mi
this was pulling the trailer empty back from roswell, driving normal speed 65mph and faster.
Got home late last night. Put the 3.5'' inter stage compressor piping on and drove to the gas station for the last 10 miles or so of this tank.
Had dump all 15w-50 weight mobil1 SJ rated bike oil I had into my engine due to a turbo oil line leak at the start of this fill up in roswell.
It was still almost a quart low.
Going to top off with good old 5w-40 rotella.
full at 414
2013-06-27 507 mi
815.94 km
26.5 gal (US)
22.07 gal (Imp)
100.31 L
893.05 kWh
($93.28 total for this fill)
19.13 mpg (US)
22.97 mpg (Imp)
12.29 L/100 km
5.23 gal (US)/100 mi
1761.44 Wh/mi
Here is a good long sample of the suburban pulling the trailer loaded down with house hold goods for a move.
One way full to the point where I couldn't see out the rear view mirror, the way back was empty.
Went over some mountians, the loaded trip had bad head winds. The return trip had calm winds.
Got my 3 and 3.5 inch piping to replace the lame 2.5'' piping between the T76 and HE351VE. Should be installed half way through next tank.
full at 292
2013-06-26 130 mi
209.21 km
4.39 gal (US)
3.66 gal (Imp)
16.62 L
147.94 kWh
($15.45 total for this fill)
29.61 mpg (US)
35.52 mpg (Imp)
7.94 L/100 km
3.38 gal (US)/100 mi
1138 Wh/mi
Drove from roswell to clovis at night doing about 45 to 50 mph most of the way, all by my self.
Winds were calm, for once.
Next day I drove normal speed 60-70mph for the last 10 miles on that fill up.
This tank had a few % WVO left over from the last fill up.
Full at 801
2013-06-15 195 mi
313.82 km
9.4 gal (US)
7.83 gal (Imp)
35.58 L
316.78 kWh
($33.09 total for this fill)
20.74 mpg (US)
24.9 mpg (Imp)
11.34 L/100 km
4.82 gal (US)/100 mi
1624.51 Wh/mi
2 of those 9.4 gallons were WVO.
Drove through Lincoln national park, went from 3300ft elevation to 8600ft over 13 miles.
Had the turbos singing the entire way boosting between 4 and 10psi.
After the mountians I was driving around thunderstorms creating strong cross winds.
2013-06-12 261 mi
420.04 km
12.4 gal (US)
10.33 gal (Imp)
46.94 L
417.88 kWh
($44.52 total for this fill)
21.05 mpg (US)
25.27 mpg (Imp)
11.18 L/100 km
4.75 gal (US)/100 mi
1601.07 Wh/mi
new air filter, cold air intake hooked up
Did lots of mountian driving with some in town driving. Carrying a few hundred pounds of tools.
2013-05-29 214 mi
344.4 km
10.9 gal (US)
9.08 gal (Imp)
41.26 L
367.33 kWh
($39.02 total for this fill)
19.63 mpg (US)
23.57 mpg (Imp)
11.98 L/100 km
5.09 gal (US)/100 mi
1716.5 Wh/mi
Driving up hill west texas to the high plains, also had 30mph cross wind gusting to 40mph.
I was headed west the wind was going north.
So much dirt in west texas and eastern NM that visibility was 300m to 30m, going to need a new air fiter after this.
Drove 65mph to 70mph most of the way.
filled up with B5.
Left front tire down about 15psi
2013-05-13 172 mi
276.81 km
8.8 gal (US)
7.33 gal (Imp)
33.31 L
296.56 kWh
($31.24 total for this fill)
19.55 mpg (US)
23.47 mpg (Imp)
12.03 L/100 km
5.12 gal (US)/100 mi
1724.19 Wh/mi
This was the first tank all with the new dual turbo setup and intercooler.
I was not driving it easy. Did some flogging on the new setup. Ran it hard multiple times to see the max boost and EGTs this setup would produce.
Had cross winds on and off driving around west texas thunder storms.
Still have warm underhood air going to the air cleaner (cool air would be ideal) and low intercooler air flow.
Filled up with regular diesel for the next tank.
2013-05-13 252 mi
405.55 km
13.7 gal (US)
11.41 gal (Imp)
51.86 L
461.69 kWh
($47.27 total for this fill)
18.39 mpg (US)
22.09 mpg (Imp)
12.79 L/100 km
5.44 gal (US)/100 mi
1832.1 Wh/mi
Last half of this tank was with the TwinTurbo setup and added intercooler with warm air intake and low air flow over the intercooler.
Also had lots of cross winds.
This milage was about 180 miles of highway driving and 70 miles driving around town.
Filled up with B5.
2013-04-29 82 mi
131.97 km
3.65 gal (US)
3.04 gal (Imp)
13.82 L
123.01 kWh
($13.65 total for this fill)
22.47 mpg (US)
26.97 mpg (Imp)
10.47 L/100 km
4.45 gal (US)/100 mi
1500.12 Wh/mi
This is me trying to get half way good fuel economy. Had real calm winds for once. Side steps were pulled off for this tank and was running 5% biodiesel.
Kept the speed down to between 55 and 65.
Side steps were stowed in back, pulled them out for this tank.
Full at 449.
2013-04-29 173 mi
278.42 km
9 gal (US)
7.49 gal (Imp)
34.07 L
303.3 kWh
($31.14 total for this fill)
19.22 mpg (US)
23.1 mpg (Imp)
12.24 L/100 km
5.2 gal (US)/100 mi
1753.18 Wh/mi
filled up with 5% biodiesel this time.
Had light winds, up hill drive, pulled the side steps off the suburban and dropped off a few hundred pounds of junk.
2013-04-29 312 mi
502.12 km
15.7 gal (US)
13.07 gal (Imp)
59.43 L
529.09 kWh
($58.09 total for this fill)
19.87 mpg (US)
23.87 mpg (Imp)
11.84 L/100 km
5.03 gal (US)/100 mi
1695.8 Wh/mi
The down hill drive. Just replaced the turbo and changed the oil. Really flogged it hard drove 70-75mph most of the way, held 80mph at several different times, took it up to 90mph for a few miles.
Had cross winds. This should not have been a good tank.
Filled at 0200
2013-04-27 518 mi
833.64 km
26.9 gal (US)
22.4 gal (Imp)
101.83 L
906.53 kWh
($98.19 total for this fill)
19.26 mpg (US)
23.13 mpg (Imp)
12.22 L/100 km
5.19 gal (US)/100 mi
1750.06 Wh/mi
The turbocharger was in the process of dieing this tank, bearings went out caused turbine and compressor to contact their housings. I replaced my turbocharger and changed the oil for next tank.
Full at 907
2013-04-01 324 mi
521.43 km
15.09 gal (US)
12.56 gal (Imp)
57.12 L
508.53 kWh
($55.83 total for this fill)
21.47 mpg (US)
25.8 mpg (Imp)
10.95 L/100 km
4.66 gal (US)/100 mi
1569.54 Wh/mi
Road trip, no trailer, some cross winds, carrying 400lb of tools, 70lb spare tire, floor jack, air compressor, 1 other person, 2 large dogs, a full size mattress, an old sitting chair from the 1970s.
Speeds were 65 most of the way with 80mph down hill runs.
Full at 398
Edit: turbocharger may have started going out towards the end of this tank.
2013-03-30 545 mi
877.09 km
31.3 gal (US)
26.06 gal (Imp)
118.48 L
1054.81 kWh
($121.13 total for this fill)
17.41 mpg (US)
20.91 mpg (Imp)
13.51 L/100 km
5.74 gal (US)/100 mi
1935.43 Wh/mi
It just started to warm up since the last 1/4 of this tank, also been having lots of cross winds.
Full at 1084
2013-02-24 241 mi
387.85 km
14.33 gal (US)
11.93 gal (Imp)
54.24 L
482.92 kWh
($60.9 total for this fill)
16.82 mpg (US)
20.2 mpg (Imp)
13.98 L/100 km
5.95 gal (US)/100 mi
2003.82 Wh/mi
First good tank with the new thermostat.
Its been a typical winter, cold starts, cross winds, have not been using the block heaters.
2012-12-19 250 mi
402.34 km
13.7 gal (US)
11.41 gal (Imp)
51.86 L
461.69 kWh
($53.02 total for this fill)
18.25 mpg (US)
21.91 mpg (Imp)
12.89 L/100 km
5.48 gal (US)/100 mi
1846.76 Wh/mi
Loaded down with well over 1000lb. The trailer was loaded about 3 to 4 feet high with empty shelves.
Also have a small fuel leak, enough of a leak to drip off the fuel filter when in motion and wet the frame rail.
full at 043
2012-12-19 281 mi
452.23 km
14.01 gal (US)
11.66 gal (Imp)
53.03 L
472.14 kWh
($53.24 total for this fill)
20.06 mpg (US)
24.1 mpg (Imp)
11.73 L/100 km
4.99 gal (US)/100 mi
1680.21 Wh/mi
Pulling the trailer empty.
Started driving in the after noon, tried to get a tail wind and it turned out to be a cross wind.
Removed about 10lb of unused exhaust hangers and replaced the solid cast iron master cylinder with a much lighter aluminum one, saving 5-10 lb.
2012-12-07 162 mi
260.71 km
9 gal (US)
7.49 gal (Imp)
34.07 L
303.3 kWh
($36.72 total for this fill)
18 mpg (US)
21.63 mpg (Imp)
13.07 L/100 km
5.56 gal (US)/100 mi
1872.22 Wh/mi
Engine not getting up to full operating temp almost every monring, having strong cross winds almost every after noon.
2012-11-25 368 mi
592.24 km
19.2 gal (US)
15.99 gal (Imp)
72.68 L
647.04 kWh
($74.88 total for this fill)
19.17 mpg (US)
23.01 mpg (Imp)
12.27 L/100 km
5.22 gal (US)/100 mi
1758.26 Wh/mi
The road trip return trip.
Had head winds most of the way, stayed at 55 to 60mph then when winds let up sped up to 60 and 70mph.
Drove around town for about 40-50 miles.
Full at 370
2012-11-25 321 mi
516.6 km
15.44 gal (US)
12.86 gal (Imp)
58.45 L
520.33 kWh
($61.76 total for this fill)
20.79 mpg (US)
24.96 mpg (Imp)
11.31 L/100 km
4.81 gal (US)/100 mi
1620.97 Wh/mi
Road trip. 65-75 mph with cross winds
2012-11-23 308 mi
495.68 km
16.38 gal (US)
13.64 gal (Imp)
62.01 L
552.01 kWh
($66.67 total for this fill)
18.8 mpg (US)
22.58 mpg (Imp)
12.51 L/100 km
5.32 gal (US)/100 mi
1792.24 Wh/mi
Got 2 gallons of free fuel.
Its been cold and the engine does not get up to operating temp during morning drives.
Just driving around.
2012-10-31 248 mi
399.12 km
13.2 gal (US)
10.99 gal (Imp)
49.97 L
444.84 kWh
($53.33 total for this fill)
18.79 mpg (US)
22.57 mpg (Imp)
12.52 L/100 km
5.32 gal (US)/100 mi
1793.71 Wh/mi
Not warming up to operating temp on the morning drive to work.
Haven't bothered using the block heaters yet.
Some cross winds.
Filled at 404 miles
2012-10-21 103 mi
165.76 km
5.8 gal (US)
4.83 gal (Imp)
21.96 L
195.46 kWh
($23.14 total for this fill)
17.76 mpg (US)
21.33 mpg (Imp)
13.25 L/100 km
5.63 gal (US)/100 mi
1897.67 Wh/mi
Drove back from Amarillo, had 26mph cross/head wind gusting to 45mph, drove 55-65mph the whole way.
In the worst of the wind the engine ran at 2psi boost and 800'F EGTs @55mph, with out wind those are typical 75mph boost and EGT numbers.
Worst head winds since feb of 2011.
Still need to fix fuel leak.
2012-10-21 108 mi
173.81 km
4.5 gal (US)
3.75 gal (Imp)
17.03 L
151.65 kWh
24 mpg (US)
28.8 mpg (Imp)
9.8 L/100 km
4.17 gal (US)/100 mi
1404.17 Wh/mi
Followed my friend to Amarillo,TX at 65-70mph most of the way.
Fuel leak, found 8'' diameter fuel wet spot under the #2 fuel filter next morning.
Some corss wind
2012-10-19 233 mi
374.98 km
13.5 gal (US)
11.24 gal (Imp)
51.1 L
454.95 kWh
17.26 mpg (US)
20.73 mpg (Imp)
13.63 L/100 km
5.79 gal (US)/100 mi
1952.58 Wh/mi
Lots of driving in town.
Pulled 2 trailer loads of wood, its getting cold enough to where I'm not getting up to full operating temperature.
First tank with the new rear step bumper.
Also running about 2 gallons of WVO in the fuel.
Did 2 engine runs about 20 minutes each to fix coolant leak and isolate battery charge problem.

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

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