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Fuel log graph
Efficiency log for: The Beast - 1986 Ford F-150 XLT
  • Lifetime Fuel Economy: 8.6 mpg (US), 27.4 L/100 km, 10.3 mpg (Imp)
  • 90-day Fuel Economy: 8.2 mpg (US), 28.5 L/100 km, 9.9 mpg (Imp)
  • 3-tank Fuel Economy: 7.5 mpg (US), 31.3 L/100 km, 9 mpg (Imp)
  • EPA Combined Rating / % over rating: 12 mpg (US) / -31.3% (based on 90-day fuel economy)
  • Total fills: 41
  • Average cost per gal/L: $3.46 per gal (US); $0.00 per L (price data entered for 36 fill/s)
  • Average cost per fill: $63.11
  • Average distance cost: $0.41 per mi. / $0.25 per km
  • Total fuel used: 733.81 gal (US), 2777.8 L
  • Total distance traveled: 6314 mi. / 10161.4 km
  • Total cost: $2,272.08
  • Total fuel saved vs. EPA: -207.6 gal. (US) / -785.9 L
  • Total saved: $-718.3 (based on avg. cost per gal./L)
  • Average tank distance: 154 mi. / 247.8 km
Fill date Distance Fill amount Price Fuel Economy Details
2013-10-26 86 mi
138.4 km
18.61 gal (US)
15.5 gal (Imp)
70.45 L
627.16 kWh
$3.28
($61.04 total for this fill)
4.62 mpg (US)
5.55 mpg (Imp)
50.9 L/100 km
21.64 gal (US)/100 mi
7292.56 Wh/mi
2013-08-24 217 mi
349.23 km
18.16 gal (US)
15.12 gal (Imp)
68.74 L
611.99 kWh
$3.5
($63.56 total for this fill)
11.95 mpg (US)
14.35 mpg (Imp)
19.68 L/100 km
8.37 gal (US)/100 mi
2820.23 Wh/mi
2013-06-01 111 mi
178.64 km
18.28 gal (US)
15.22 gal (Imp)
69.2 L
616.04 kWh
$3.48
($63.61 total for this fill)
6.07 mpg (US)
7.29 mpg (Imp)
38.74 L/100 km
16.47 gal (US)/100 mi
5549.91 Wh/mi
2013-05-11 191 mi
307.38 km
17.17 gal (US)
14.3 gal (Imp)
65 L
578.63 kWh
$3.44
($59.06 total for this fill)
11.12 mpg (US)
13.36 mpg (Imp)
21.15 L/100 km
8.99 gal (US)/100 mi
3029.48 Wh/mi
2013-04-15 112 mi
180.25 km
18.274 gal (US)
15.22 gal (Imp)
69.17 L
615.83 kWh
$3.3
($60.3 total for this fill)
6.13 mpg (US)
7.36 mpg (Imp)
38.37 L/100 km
16.32 gal (US)/100 mi
5498.48 Wh/mi
NOPE! Last tanks "good" mileage was due to the fact that I drove farther after switching tanks, but before filling up.

Two tank average: 8.33 mpg.
2013-04-04 193 mi
310.6 km
18.34 gal (US)
15.27 gal (Imp)
69.42 L
618.06 kWh
$3.43
($62.91 total for this fill)
10.52 mpg (US)
12.64 mpg (Imp)
22.35 L/100 km
9.5 gal (US)/100 mi
3202.38 Wh/mi
better mileage may be attributed to the fact that I dumped over 2,000 lbs of steel out of the back, at the scrap yard. We'll see.
2013-03-15 109 mi
175.42 km
18.07 gal (US)
15.05 gal (Imp)
68.4 L
608.96 kWh
$3.52
($63.61 total for this fill)
6.03 mpg (US)
7.24 mpg (Imp)
38.99 L/100 km
16.58 gal (US)/100 mi
5586.79 Wh/mi
well... This sucks. My crankshaft is bent. I just hope I can nurse it along until I get Bettie back up and running, so I can tear into it.
2013-03-02 142 mi
228.53 km
17.83 gal (US)
14.85 gal (Imp)
67.49 L
600.87 kWh
$4.16
($74.17 total for this fill)
7.96 mpg (US)
9.56 mpg (Imp)
29.53 L/100 km
12.56 gal (US)/100 mi
4231.48 Wh/mi
2013-02-15 148 mi
238.18 km
18.66 gal (US)
15.54 gal (Imp)
70.64 L
628.84 kWh
$3.56
($66.43 total for this fill)
7.93 mpg (US)
9.52 mpg (Imp)
29.66 L/100 km
12.61 gal (US)/100 mi
4248.92 Wh/mi
2013-01-31 135 mi
217.26 km
17.69 gal (US)
14.73 gal (Imp)
66.96 L
596.15 kWh
$4
($70.76 total for this fill)
7.63 mpg (US)
9.16 mpg (Imp)
30.82 L/100 km
13.1 gal (US)/100 mi
4415.93 Wh/mi
2013-01-22 157 mi
252.67 km
17.55 gal (US)
14.61 gal (Imp)
66.43 L
591.44 kWh
$3.43
($60.2 total for this fill)
8.95 mpg (US)
10.75 mpg (Imp)
26.29 L/100 km
11.18 gal (US)/100 mi
3767.13 Wh/mi
2013-01-10 119 mi
191.51 km
18.09 gal (US)
15.06 gal (Imp)
68.48 L
609.63 kWh
$3.49
($63.13 total for this fill)
6.58 mpg (US)
7.9 mpg (Imp)
35.76 L/100 km
15.2 gal (US)/100 mi
5122.94 Wh/mi
2012-12-27 132 mi
212.43 km
17.24 gal (US)
14.36 gal (Imp)
65.26 L
580.99 kWh
$3.1
($53.44 total for this fill)
7.66 mpg (US)
9.19 mpg (Imp)
30.72 L/100 km
13.06 gal (US)/100 mi
4401.44 Wh/mi
Not as I had hoped. I need to tear this down and figure out what's wrong. I know I'm going to reinstall manifold heat when I do, which will allow leaner burning, for sure.
2012-12-15 165 mi
265.54 km
18.16 gal (US)
15.12 gal (Imp)
68.74 L
611.99 kWh
$3.12
($56.66 total for this fill)
9.09 mpg (US)
10.91 mpg (Imp)
25.89 L/100 km
11.01 gal (US)/100 mi
3709.03 Wh/mi
Well, I was right about this tank, and I just dumped 2,000lbs of scrap metal, so the next tank should be even better.

The engine is still out of balance, and I think that's got something to do with my mileage, but the rear tank leakage is probably a bigger problem.
2012-11-28 149 mi
239.79 km
27.32 gal (US)
22.75 gal (Imp)
103.42 L
920.68 kWh
$3.23
($88.24 total for this fill)
5.45 mpg (US)
6.55 mpg (Imp)
43.13 L/100 km
18.34 gal (US)/100 mi
6179.06 Wh/mi
Carburetor got something stuck in it, and this thing -sucked- the fuel down. had to run partially into the next tank, further killing my mileage. Next tank should be a little better, and the one after it, even better, since I just rebuilt the carburetor on December 11.
2012-11-13 158 mi
254.28 km
18.06 gal (US)
15.04 gal (Imp)
68.36 L
608.62 kWh
$3.58
($64.65 total for this fill)
8.75 mpg (US)
10.51 mpg (Imp)
26.88 L/100 km
11.43 gal (US)/100 mi
3852.03 Wh/mi
2012-10-30 163 mi
262.32 km
17.61 gal (US)
14.66 gal (Imp)
66.66 L
593.46 kWh
$2.33
($41.03 total for this fill)
9.26 mpg (US)
11.12 mpg (Imp)
25.41 L/100 km
10.8 gal (US)/100 mi
3640.86 Wh/mi
2012-10-18 148 mi
238.18 km
17.77 gal (US)
14.8 gal (Imp)
67.27 L
598.85 kWh
$3.54
($62.91 total for this fill)
8.33 mpg (US)
10 mpg (Imp)
28.24 L/100 km
12.01 gal (US)/100 mi
4046.28 Wh/mi
2012-10-06 202 mi
325.09 km
18.93 gal (US)
15.76 gal (Imp)
71.66 L
637.94 kWh
$3.52
($66.63 total for this fill)
10.67 mpg (US)
12.82 mpg (Imp)
22.04 L/100 km
9.37 gal (US)/100 mi
3158.12 Wh/mi
2012-09-21 211 mi
339.57 km
23.75 gal (US)
19.78 gal (Imp)
89.9 L
800.38 kWh
$3.69
($87.64 total for this fill)
8.88 mpg (US)
10.67 mpg (Imp)
26.47 L/100 km
11.26 gal (US)/100 mi
3793.27 Wh/mi
some highway. Something is very wrong with the engine. Vibrates pretty bad above about 2000rpm. I'm going to have to pull the rotating assembly after I finish Bettie's new engine. She spun a rod bearing. How do I have this kind of luck with cars?
2012-09-11 156 mi
251.06 km
17.3 gal (US)
14.41 gal (Imp)
65.49 L
583.01 kWh
$3.78
($65.39 total for this fill)
9.02 mpg (US)
10.83 mpg (Imp)
26.09 L/100 km
11.09 gal (US)/100 mi
3737.24 Wh/mi
just switched over to ported vacuum on the emissions carb. Much better behavior, but still has a slight off-idle stumble when cold.
2012-09-01 144 mi
231.75 km
18.81 gal (US)
15.66 gal (Imp)
71.2 L
633.9 kWh
$3.93
($73.92 total for this fill)
7.66 mpg (US)
9.2 mpg (Imp)
30.72 L/100 km
13.06 gal (US)/100 mi
4402.08 Wh/mi
bleh. Having carb trouble
2012-08-21 164 mi
263.93 km
17.23 gal (US)
14.35 gal (Imp)
65.22 L
580.65 kWh
$3.92
($67.54 total for this fill)
9.52 mpg (US)
11.43 mpg (Imp)
24.71 L/100 km
10.51 gal (US)/100 mi
3540.55 Wh/mi
I have -got- to be dumping fuel somewhere... this is ridiculous. I should be deep in the 12's
2012-08-03 127 mi
204.39 km
12.42 gal (US)
10.34 gal (Imp)
47.01 L
418.55 kWh
$2.64
($32.79 total for this fill)
10.23 mpg (US)
12.28 mpg (Imp)
23 L/100 km
9.78 gal (US)/100 mi
3295.67 Wh/mi
2012-07-21 168 mi
270.37 km
17.13 gal (US)
14.26 gal (Imp)
64.84 L
577.28 kWh
$3.61
($61.84 total for this fill)
9.81 mpg (US)
11.78 mpg (Imp)
23.98 L/100 km
10.2 gal (US)/100 mi
3436.19 Wh/mi
2012-07-09 193 mi
310.6 km
17.93 gal (US)
14.93 gal (Imp)
67.87 L
604.24 kWh
$3.3
($59.17 total for this fill)
10.76 mpg (US)
12.93 mpg (Imp)
21.85 L/100 km
9.29 gal (US)/100 mi
3130.78 Wh/mi
2012-06-21 167 mi
268.76 km
19.1 gal (US)
15.9 gal (Imp)
72.3 L
643.67 kWh
$3.28
($62.65 total for this fill)
8.74 mpg (US)
10.5 mpg (Imp)
26.9 L/100 km
11.44 gal (US)/100 mi
3854.31 Wh/mi
2012-06-05 198 mi
318.65 km
22.57 gal (US)
18.79 gal (Imp)
85.44 L
760.61 kWh
$3.34
($75.38 total for this fill)
8.77 mpg (US)
10.54 mpg (Imp)
26.81 L/100 km
11.4 gal (US)/100 mi
3841.46 Wh/mi
forgot that I had switched tanks, so I had to fill both. This one will be a little low.
2012-05-19 166 mi
267.15 km
17.67 gal (US)
14.71 gal (Imp)
66.89 L
595.48 kWh
$3.64
($64.32 total for this fill)
9.39 mpg (US)
11.28 mpg (Imp)
25.04 L/100 km
10.64 gal (US)/100 mi
3587.23 Wh/mi
2012-03-26 155 mi
249.45 km
18.23 gal (US)
15.18 gal (Imp)
69.01 L
614.35 kWh
$3.74
($68.18 total for this fill)
8.5 mpg (US)
10.21 mpg (Imp)
27.66 L/100 km
11.76 gal (US)/100 mi
3963.55 Wh/mi
finally got carb preheat fully functional. Now that the cold is gone. <_< *shrugs*
2012-01-14 155 mi
249.45 km
19.05 gal (US)
15.86 gal (Imp)
72.11 L
641.99 kWh
$3.4
($64.77 total for this fill)
8.14 mpg (US)
9.77 mpg (Imp)
28.91 L/100 km
12.29 gal (US)/100 mi
4141.87 Wh/mi
2011-11-04 199 mi
320.26 km
18.27 gal (US)
15.21 gal (Imp)
69.16 L
615.7 kWh
$3.26
($59.56 total for this fill)
10.89 mpg (US)
13.08 mpg (Imp)
21.59 L/100 km
9.18 gal (US)/100 mi
3093.97 Wh/mi
First tank of driving it daily, same routes as the Turd normally takes, minus the highway on Sunday.

This confirms that evaporation is killing me. I need to repair/redesign the evap system before I get too many more miles under it.

Side note: I got carb preheat (almost) functioning, which will help as things get colder
2011-10-22 85 mi
136.79 km
12.12 gal (US)
10.09 gal (Imp)
45.88 L
408.44 kWh
$3.38
($40.97 total for this fill)
7.01 mpg (US)
8.42 mpg (Imp)
33.54 L/100 km
14.26 gal (US)/100 mi
4805.18 Wh/mi
I had a malfunction and couldn't figure out which tank had fuel, so once I got it restarted, I topped off both tanks. I now know that evaporation is killing my mileage.
2011-10-07 128 mi
206 km
17.62 gal (US)
14.67 gal (Imp)
66.7 L
593.79 kWh
$3.16
($55.68 total for this fill)
7.26 mpg (US)
8.73 mpg (Imp)
32.38 L/100 km
13.77 gal (US)/100 mi
4638.98 Wh/mi
first full tank after top-end rebuild... man, that skinny pedal is fun...
2011-09-10 150 mi
241.4 km
18.22 gal (US)
15.17 gal (Imp)
68.97 L
614.01 kWh
$3.45
($62.86 total for this fill)
8.23 mpg (US)
9.89 mpg (Imp)
28.57 L/100 km
12.15 gal (US)/100 mi
4093.4 Wh/mi
2011-05-29 138 mi
222.09 km
17.47 gal (US)
14.55 gal (Imp)
66.13 L
588.74 kWh
$3.84
($67.08 total for this fill)
7.9 mpg (US)
9.48 mpg (Imp)
29.78 L/100 km
12.66 gal (US)/100 mi
4266.23 Wh/mi
Filled with mid-grade... see what happens
2011-04-10 163 mi
262.32 km
18.14 gal (US)
15.11 gal (Imp)
68.67 L
611.32 kWh
8.99 mpg (US)
10.79 mpg (Imp)
26.18 L/100 km
11.13 gal (US)/100 mi
3750.43 Wh/mi
2011-03-26 173 mi
278.42 km
17.44 gal (US)
14.52 gal (Imp)
66.02 L
587.73 kWh
9.92 mpg (US)
11.91 mpg (Imp)
23.71 L/100 km
10.08 gal (US)/100 mi
3397.28 Wh/mi
2011-03-16 122 mi
196.34 km
11.46 gal (US)
9.54 gal (Imp)
43.38 L
386.2 kWh
10.65 mpg (US)
12.79 mpg (Imp)
22.09 L/100 km
9.39 gal (US)/100 mi
3165.57 Wh/mi
2011-03-10 176 mi
283.24 km
18.13 gal (US)
15.1 gal (Imp)
68.63 L
610.98 kWh
9.71 mpg (US)
11.66 mpg (Imp)
24.23 L/100 km
10.3 gal (US)/100 mi
3471.48 Wh/mi
2011-03-06 139 mi
223.7 km
11.94 gal (US)
9.94 gal (Imp)
45.2 L
402.38 kWh
11.64 mpg (US)
13.98 mpg (Imp)
20.21 L/100 km
8.59 gal (US)/100 mi
2894.82 Wh/mi

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


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