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Fuel log graph
Efficiency log for: Penelope - 1999 Pontiac Grand Prix GTP
  • Lifetime Fuel Economy: 33.8 mpg (US), 7 L/100 km, 40.6 mpg (Imp)
  • 90-day Fuel Economy: 32 mpg (US), 7.4 L/100 km, 38.4 mpg (Imp)
  • 3-tank Fuel Economy: 30 mpg (US), 7.8 L/100 km, 36.1 mpg (Imp)
  • EPA Combined Rating / % over rating: 19 mpg (US) / 68.2% (based on 90-day fuel economy)
  • Total fills: 30
  • Average cost per gal/L: $2.64 per gal (US); $0.00 per L (price data entered for 21 fill/s)
  • Average cost per fill: $22.23
  • Average distance cost: $0.08 per mi. / $0.05 per km
  • Total fuel used: 254.43 gal (US), 963.1 L
  • Total distance traveled: 8599.2 mi. / 13839.1 km
  • Total cost: $466.76
  • Total fuel saved vs. EPA: 198.2 gal. (US) / 750.3 L
  • Total saved: $523.25 (based on avg. cost per gal./L)
  • Average tank distance: 286.6 mi. / 461.3 km
Fill date Distance Fill amount Price Fuel Economy Details
2016-04-21 342 mi
550.4 km
10.7 gal (US)
8.91 gal (Imp)
40.5 L
360.59 kWh
$2.79
($29.85 total for this fill)
31.96 mpg (US)
38.38 mpg (Imp)
7.36 L/100 km
3.13 gal (US)/100 mi
1054.36 Wh/mi
Super 93

Air dam was removed due to damage. Fixed wheel spats
2015-12-13 433 mi
696.85 km
14.9 gal (US)
12.41 gal (Imp)
56.4 L
502.13 kWh
$3.03
($45.15 total for this fill)
29.06 mpg (US)
34.89 mpg (Imp)
8.09 L/100 km
3.44 gal (US)/100 mi
1159.65 Wh/mi
Turnpike @ 65-70 mph

Bottom air dam came off and one wheel spat is loose

Colder and windy. Mid 40s, gusts around 40 mph at regular intervals
2015-12-13 102 mi
164.15 km
3.6 gal (US)
3 gal (Imp)
13.63 L
121.32 kWh
28.33 mpg (US)
34 mpg (Imp)
8.3 L/100 km
3.53 gal (US)/100 mi
1189.41 Wh/mi
Back and forth between hotel and work area all week, probably 40% city compared to the usual 10-20. Not too bad
2015-12-07 137 mi
220.48 km
4.18 gal (US)
3.48 gal (Imp)
15.82 L
140.87 kWh
$2.83
($11.83 total for this fill)
32.78 mpg (US)
39.37 mpg (Imp)
7.18 L/100 km
3.05 gal (US)/100 mi
1028.25 Wh/mi
more turnpike
2015-12-07 487 mi
783.75 km
14.89 gal (US)
12.4 gal (Imp)
56.36 L
501.79 kWh
$2.99
($44.52 total for this fill)
32.71 mpg (US)
39.27 mpg (Imp)
7.19 L/100 km
3.06 gal (US)/100 mi
1030.37 Wh/mi
Turnpike @ 75 mph

She doesn't do well above 65, but I need to get there by a certain time

Weather is excellent. No rain, upper 50s, lower 60s.
2015-12-07 384 mi
617.99 km
10.9 gal (US)
9.08 gal (Imp)
41.26 L
367.33 kWh
$2.39
($26.05 total for this fill)
35.23 mpg (US)
42.29 mpg (Imp)
6.68 L/100 km
2.84 gal (US)/100 mi
956.59 Wh/mi
Ugh, lost my mileage log for November

93 octane

Headed to CT on a ~600 mile trip
2015-10-01 322 mi
518.21 km
8.31 gal (US)
6.92 gal (Imp)
31.46 L
280.05 kWh
38.75 mpg (US)
46.53 mpg (Imp)
6.07 L/100 km
2.58 gal (US)/100 mi
869.72 Wh/mi
Nothing notable. Started using block heater. Weather is still in the upper 50s
2015-09-16 310 mi
498.9 km
8.2 gal (US)
6.83 gal (Imp)
31.04 L
276.34 kWh
37.8 mpg (US)
45.39 mpg (Imp)
6.22 L/100 km
2.65 gal (US)/100 mi
891.42 Wh/mi
2015-09-09 322 mi
518.21 km
8.48 gal (US)
7.06 gal (Imp)
32.1 L
285.78 kWh
$2.56
($21.71 total for this fill)
37.97 mpg (US)
45.61 mpg (Imp)
6.19 L/100 km
2.63 gal (US)/100 mi
887.52 Wh/mi
93 octane

Replaced front steel impact bar w/ aluminum one from an '03 Aztec. Seems a little more nimbly-bimbly on take-off. Shed ~20 pounds

New front struts, rears coming soon

Ecopia EP422 ECO tires in front. I didn't notice much with the tires other than improved handling and traction compared to my worn out tires.
2015-08-30 299 mi
481.19 km
8.51 gal (US)
7.09 gal (Imp)
32.21 L
286.79 kWh
35.14 mpg (US)
42.17 mpg (Imp)
6.69 L/100 km
2.85 gal (US)/100 mi
959.16 Wh/mi
91 octane

Front tires severely worn, pulling lightly to the right

I might have to let er sleep until my new struts and bushings come in
2015-08-22 352 mi
566.49 km
9.5 gal (US)
7.91 gal (Imp)
35.96 L
320.15 kWh
$2.42
($22.99 total for this fill)
37.05 mpg (US)
44.5 mpg (Imp)
6.35 L/100 km
2.7 gal (US)/100 mi
909.52 Wh/mi
91 octane
2015-08-14 262 mi
421.65 km
6.7 gal (US)
5.58 gal (Imp)
25.36 L
225.79 kWh
$3.56
($23.85 total for this fill)
39.1 mpg (US)
46.95 mpg (Imp)
6.01 L/100 km
2.56 gal (US)/100 mi
861.79 Wh/mi
Super 93

Big changes!! Got tuning hardware and software

-timing table from '04 Grand Prix Comp G (same engine, more agrerssive fuel and timing tables)
-Bumped cruise timing advance forward 3 degrees
-Reduced idle fueling by 3% (it was running rich anyways)
-Used trans shift speeds and firmness from '04 Comp G - about 20% decrease in shift time/slippage
-Bumped TCC engage in 4th gear from 45 to 40 (there are a few 45 mph sections on my route home and it hadn't been turning the tcc on.
2015-08-11 322 mi
518.21 km
8.96 gal (US)
7.46 gal (Imp)
33.92 L
301.95 kWh
$2.89
($25.89 total for this fill)
35.94 mpg (US)
43.16 mpg (Imp)
6.55 L/100 km
2.78 gal (US)/100 mi
937.73 Wh/mi
Super 93
Took the alt. route home. All speeds <=60 mph
2015-08-03 342 mi
550.4 km
10.06 gal (US)
8.38 gal (Imp)
38.08 L
339.02 kWh
34 mpg (US)
40.81 mpg (Imp)
6.92 L/100 km
2.94 gal (US)/100 mi
991.29 Wh/mi
91 octane
2015-06-18 353 mi
568.1 km
10.68 gal (US)
8.89 gal (Imp)
40.43 L
359.92 kWh
$2.52
($26.91 total for this fill)
33.05 mpg (US)
39.71 mpg (Imp)
7.12 L/100 km
3.03 gal (US)/100 mi
1019.6 Wh/mi
E30 mix with some questionable 87 octane in the mix

Resonator replaced with a glasspack. Mufflers reconnected.

Road debris took out both wheel spats early in the week. I'm glad i slotted the mounting holes

Front tires may be a bit low due to cooler weather and rough roads due to construction.
2015-06-10 246 mi
395.9 km
6.48 gal (US)
5.4 gal (Imp)
24.53 L
218.38 kWh
$3.16
($20.48 total for this fill)
37.96 mpg (US)
45.56 mpg (Imp)
6.2 L/100 km
2.63 gal (US)/100 mi
887.72 Wh/mi
Gas prices going up

The exhaust patch on the resonator blew out. Car has been intolerably loud
2015-06-05 322 mi
518.21 km
8.69 gal (US)
7.24 gal (Imp)
32.9 L
292.85 kWh
37.05 mpg (US)
44.48 mpg (Imp)
6.35 L/100 km
2.7 gal (US)/100 mi
909.47 Wh/mi
Super 93!

Kept AC off as much as possible

LED tail light bulbs (only has an effect when brakes or on or lights are on)

I suspect the resonator is rusting out again (still?), it's gotten a bit louder
2015-05-21 318 mi
511.77 km
8.81 gal (US)
7.34 gal (Imp)
33.35 L
296.9 kWh
$2.61
($22.99 total for this fill)
36.1 mpg (US)
43.32 mpg (Imp)
6.52 L/100 km
2.77 gal (US)/100 mi
933.65 Wh/mi
block heater back in action

'91 octane (all they had? price was good)

passenger side mirror delete - The seal was leaking so i thought I would try taking it off

door trims removed to replace broken window regulator and OEM speakers from 1998

10% city 90% hwy
2015-05-13 331 mi
532.69 km
10.59 gal (US)
8.82 gal (Imp)
40.09 L
356.88 kWh
31.26 mpg (US)
37.53 mpg (Imp)
7.53 L/100 km
3.2 gal (US)/100 mi
1078.19 Wh/mi
still no block heater

Ran E30 due to increase in gas prices
2015-05-05 327 mi
526.26 km
10.2 gal (US)
8.49 gal (Imp)
38.61 L
343.74 kWh
$2.69
($27.44 total for this fill)
32.06 mpg (US)
38.52 mpg (Imp)
7.34 L/100 km
3.12 gal (US)/100 mi
1051.19 Wh/mi
I accidentally burned the block heater cord on the exhaust last week, so no block heater

Super '93 all the way
2015-04-28 282 mi
453.84 km
8.62 gal (US)
7.18 gal (Imp)
32.63 L
290.49 kWh
32.71 mpg (US)
39.28 mpg (Imp)
7.19 L/100 km
3.06 gal (US)/100 mi
1030.11 Wh/mi
50-65 mph to work

91.8 octane (E30 mix)
2015-04-20 302 mi
486.02 km
8.78 gal (US)
7.31 gal (Imp)
33.24 L
295.89 kWh
$2.67
($23.44 total for this fill)
34.4 mpg (US)
41.31 mpg (Imp)
6.84 L/100 km
2.91 gal (US)/100 mi
979.77 Wh/mi
93 octane

added weatherstripping to sides of hood
2015-04-02 147 mi
236.57 km
4.23 gal (US)
3.52 gal (Imp)
16.01 L
142.55 kWh
$2.95
($12.48 total for this fill)
34.75 mpg (US)
41.76 mpg (Imp)
6.77 L/100 km
2.88 gal (US)/100 mi
969.73 Wh/mi
Just drivin'
2015-03-22 405 mi
651.78 km
12.26 gal (US)
10.21 gal (Imp)
46.41 L
413.16 kWh
$2.01
($24.64 total for this fill)
33.03 mpg (US)
39.67 mpg (Imp)
7.12 L/100 km
3.03 gal (US)/100 mi
1020.15 Wh/mi
Took 55 mph route home everyday vs 70 mph. Using neutral during braking and at stops (auto tans, so no engine off coasting)

E25 mix of 87 octane and E85 to boost octane rating and lower price
2015-01-18 68 mi
109.44 km
2.31 gal (US)
1.92 gal (Imp)
8.74 L
77.85 kWh
$2.39
($5.52 total for this fill)
29.44 mpg (US)
35.42 mpg (Imp)
7.99 L/100 km
3.4 gal (US)/100 mi
1144.85 Wh/mi
Super 93!

Left wheel spat fell off.

Penelope is hibernating for the winter
2015-01-07 342 mi
550.4 km
11.02 gal (US)
9.18 gal (Imp)
41.72 L
371.37 kWh
31.03 mpg (US)
37.25 mpg (Imp)
7.58 L/100 km
3.22 gal (US)/100 mi
1085.88 Wh/mi
91 octane

front right wheel spat fell off.
2014-12-31 172 mi
276.81 km
6.07 gal (US)
5.05 gal (Imp)
22.98 L
204.56 kWh
$2.14
($12.99 total for this fill)
28.34 mpg (US)
34.06 mpg (Imp)
8.3 L/100 km
3.53 gal (US)/100 mi
1189.3 Wh/mi
'93 octane

very windy combined with low temperatures (<30F)

Penelope is cold blooded
2014-12-28 123.2 mi
198.27 km
3.6 gal (US)
3 gal (Imp)
13.63 L
121.32 kWh
$2.1
($7.56 total for this fill)
34.22 mpg (US)
41.07 mpg (Imp)
6.87 L/100 km
2.92 gal (US)/100 mi
984.74 Wh/mi
93 octane
2014-12-24 94 mi
151.28 km
2.97 gal (US)
2.47 gal (Imp)
11.24 L
100.09 kWh
$1.98
($5.88 total for this fill)
31.65 mpg (US)
38.06 mpg (Imp)
7.43 L/100 km
3.16 gal (US)/100 mi
1064.79 Wh/mi
Ran 87 octane instead of 93 because the below freezing ambient temperatures lower the intake temps enough to not knock under low to mid boost conditions.

Might lower FE if the ECM switches to crappy fuel mode (less timing advance)
2014-12-23 351 mi
564.88 km
11.23 gal (US)
9.35 gal (Imp)
42.51 L
378.45 kWh
$2.19
($24.59 total for this fill)
31.26 mpg (US)
37.54 mpg (Imp)
7.53 L/100 km
3.2 gal (US)/100 mi
1078.21 Wh/mi
blocked upper grill vents
weather stripping around headlights and front of hood

91 octane

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


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