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Fuel log graph
Efficiency log for: Sub2500 - 1986 GMC Suburban C2500
  • Lifetime Fuel Economy: 11.3 mpg (US), 20.9 L/100 km, 13.5 mpg (Imp)
  • 90-day Fuel Economy: 12 mpg (US), 19.7 L/100 km, 14.4 mpg (Imp)
  • 3-tank Fuel Economy: 10.8 mpg (US), 21.8 L/100 km, 13 mpg (Imp)
  • EPA Combined Rating / % over rating: 8 mpg (US) / 49.4% (based on 90-day fuel economy)
  • Total fills: 12
  • Average cost per gal/L: $2.52 per gal (US); $0.00 per L (price data entered for 12 fill/s)
  • Average cost per fill: $23.58
  • Average distance cost: $0.22 per mi. / $0.14 per km
  • Total fuel used: 112.38 gal (US), 425.4 L
  • Total distance traveled: 1267.1 mi. / 2039.2 km
  • Total cost: $282.92
  • Total fuel saved vs. EPA: 46 gal. (US) / 174.1 L
  • Total saved: $115.92 (based on avg. cost per gal./L)
  • Average tank distance: 105.6 mi. / 169.9 km
Fill date Distance Fill amount Price Fuel Economy Details
2015-10-15 59 mi
94.95 km
4.75 gal (US)
3.96 gal (Imp)
17.98 L
160.08 kWh
$2.23
($10.59 total for this fill)
12.42 mpg (US)
14.9 mpg (Imp)
18.94 L/100 km
8.05 gal (US)/100 mi
2713.22 Wh/mi
Radiator fan and P/S pump drive belt pulled.
Now that the cooling system is staying full its taking longer to warm up.
2015-10-10 215 mi
346.01 km
19.1 gal (US)
15.9 gal (Imp)
72.3 L
643.67 kWh
$2.35
($44.89 total for this fill)
11.26 mpg (US)
13.52 mpg (Imp)
20.9 L/100 km
8.88 gal (US)/100 mi
2993.81 Wh/mi
Less EOC due to lots of rain and fogging of the wind shield.
Pulling the P/S belt, belt driven radiator fan and putting in a new radiator for the next tank.
2015-09-19 123.5 mi
198.75 km
12.97 gal (US)
10.8 gal (Imp)
49.1 L
437.09 kWh
$2.4
($31.13 total for this fill)
9.52 mpg (US)
11.44 mpg (Imp)
24.7 L/100 km
10.5 gal (US)/100 mi
3539.19 Wh/mi
Been going to work before sun rise and leaving at or after dark and a weak battery has been keeping me from doing EOC with the headlights on.
New optima battery and LED headlights that use a lot less amps will allow me to EOC in the dark as much as I want.
2015-09-01 93 mi
149.67 km
7.11 gal (US)
5.92 gal (Imp)
26.91 L
239.61 kWh
$2.65
($18.84 total for this fill)
13.08 mpg (US)
15.71 mpg (Imp)
17.98 L/100 km
7.65 gal (US)/100 mi
2576.45 Wh/mi
Its getting dark earlier, doing a little less EOC.
2015-08-24 147 mi
236.57 km
12.5 gal (US)
10.41 gal (Imp)
47.32 L
421.25 kWh
$2.7
($33.75 total for this fill)
11.76 mpg (US)
14.12 mpg (Imp)
20 L/100 km
8.5 gal (US)/100 mi
2865.65 Wh/mi
Now if it is a cloudy morning its also dark. I don't want to try EOC with the head lights on. If I leave work later than normal its also dark. So I am doing more normal driving, less EOC.
MPGs reflect EOC good for getting more MPG, normal driving, eats up more fuel.
2015-08-11 126 mi
202.78 km
9.78 gal (US)
8.14 gal (Imp)
37.02 L
329.59 kWh
$2.6
($25.43 total for this fill)
12.88 mpg (US)
15.48 mpg (Imp)
18.26 L/100 km
7.76 gal (US)/100 mi
2615.79 Wh/mi
Filled up at the same place.
EOC, no highway driving.
2015-07-27 107 mi
172.2 km
6.7 gal (US)
5.58 gal (Imp)
25.36 L
225.79 kWh
$2.77
($18.56 total for this fill)
15.97 mpg (US)
19.18 mpg (Imp)
14.73 L/100 km
6.26 gal (US)/100 mi
2110.19 Wh/mi
Ran about 50 miles on the highway. A/F stayed around 16:1.
Lots of EOC as usual.
2015-07-21 100 mi
160.93 km
8.33 gal (US)
6.94 gal (Imp)
31.53 L
280.72 kWh
$2.5
($20.83 total for this fill)
12 mpg (US)
14.41 mpg (Imp)
19.59 L/100 km
8.33 gal (US)/100 mi
2807.2 Wh/mi
Same gas station, same pump, vehicle pointing the same direction.
I had one race against a tornado warning hail producing thunder storm I had to head off by getting to the high way before it did. Gas petal was on the floor and speedometer maxed out for about 5 miles.
The WOT and near WOT carb tune is good.
2015-06-29 87 mi
140.01 km
6.82 gal (US)
5.68 gal (Imp)
25.82 L
229.83 kWh
$2.7
($18.41 total for this fill)
12.76 mpg (US)
15.32 mpg (Imp)
18.44 L/100 km
7.84 gal (US)/100 mi
2641.72 Wh/mi
Tried to EOC more and not floor it as much.
Same gas station, same pump, pointing the same direction.
No carb or timing adjustments since before that 11mpg tank.
2015-06-20 72.1 mi
116.03 km
6.16 gal (US)
5.13 gal (Imp)
23.32 L
207.59 kWh
$2.7
($16.63 total for this fill)
11.7 mpg (US)
14.05 mpg (Imp)
20.1 L/100 km
8.54 gal (US)/100 mi
2879.2 Wh/mi
Did a lot of EOC. But there was room for more.
Filled up as the same pump parked in the same spot pointed in the same direction as last time.
2015-06-20 82.5 mi
132.77 km
9.76 gal (US)
8.13 gal (Imp)
36.95 L
328.91 kWh
$2.6
($25.38 total for this fill)
8.45 mpg (US)
10.15 mpg (Imp)
27.83 L/100 km
11.83 gal (US)/100 mi
3986.79 Wh/mi
Got the air fuel ratio where I wanted but developed a fuel leak.
Driving it like a normal person.
2015-03-31 55 mi
88.51 km
8.4 gal (US)
7 gal (Imp)
31.8 L
283.08 kWh
$2.2
($18.48 total for this fill)
6.55 mpg (US)
7.86 mpg (Imp)
35.93 L/100 km
15.27 gal (US)/100 mi
5146.91 Wh/mi
Drove it a little as is. Runs rich.

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


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