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Fuel log graph
Efficiency log for: ND Miata - 2015 Mazda MX-5 Special Package
  • Lifetime Fuel Economy: 39.3 mpg (US), 6 L/100 km, 47.2 mpg (Imp)
  • 90-day Fuel Economy: 41.1 mpg (US), 5.7 L/100 km, 49.3 mpg (Imp)
  • 3-tank Fuel Economy: 38.3 mpg (US), 6.1 L/100 km, 46 mpg (Imp)
  • EPA Combined Rating / % over rating: 34 mpg (US) / 20.8% (based on 90-day fuel economy)
  • Total fills: 32
  • Average cost per gal/L: $11.05 per gal (US); $2.92 per L (price data entered for 32 fill/s)
  • Average cost per fill: $83.57
  • Average distance cost: $0.28 per mi. / $0.17 per km
  • Total fuel used: 242.34 gal (US), 917.4 L
  • Total distance traveled: 9526.1 mi. / 15330.8 km
  • Total cost: $2,674.21
  • Total fuel saved vs. EPA: 37.8 gal. (US) / 143.1 L
  • Total saved: $417.69 (based on avg. cost per gal./L)
  • Average tank distance: 297.7 mi. / 479.1 km
Fill date Distance Fill amount Price Fuel Economy Details
2023-01-30 168.82 km
104.9 mi
11.79 L
3.11 gal (US)
2.59 gal (Imp)
104.81 kWh
$2.82
($33.25 total for this fill)
6.98 L/100 km
33.73 mpg (US)
40.5 mpg (Imp)
2.96 gal (US)/100 mi
999.14 Wh/mi
Short fill, exclusively from towing. Towed large, heavy cargo trailer through the mountains, at 80-100kph.
2023-01-30 498.84 km
309.96 mi
30.53 L
8.07 gal (US)
6.72 gal (Imp)
271.96 kWh
$2.82
($86.09 total for this fill)
6.12 L/100 km
38.41 mpg (US)
46.13 mpg (Imp)
2.6 gal (US)/100 mi
877.4 Wh/mi
Summer weather, mostly clear. Used car extensively for local trips and moving to a new house.
2023-01-19 564.33 km
350.66 mi
33.26 L
8.79 gal (US)
7.32 gal (Imp)
296.22 kWh
$2.78
($92.46 total for this fill)
5.89 L/100 km
39.89 mpg (US)
47.9 mpg (Imp)
2.51 gal (US)/100 mi
844.75 Wh/mi
Filled with 98. Temperature around 20 degrees. Mostly clear.
2023-01-01 449 km
279 mi
25.08 L
6.63 gal (US)
5.52 gal (Imp)
223.43 kWh
$2.78
($69.72 total for this fill)
5.59 L/100 km
42.08 mpg (US)
50.54 mpg (Imp)
2.38 gal (US)/100 mi
800.82 Wh/mi
Last tank of road trip. Filled with 98. Warm, clear, roof down, cargo rack behind car.
2022-12-31 331.8 km
206.17 mi
17.49 L
4.62 gal (US)
3.85 gal (Imp)
155.69 kWh
$3
($52.47 total for this fill)
5.27 L/100 km
44.63 mpg (US)
53.55 mpg (Imp)
2.24 gal (US)/100 mi
755.15 Wh/mi
Road trip. Filled with 98. Warm, clear, roof down, cargo rack behind car.
2022-12-30 594.5 km
369.41 mi
33.99 L
8.98 gal (US)
7.48 gal (Imp)
302.63 kWh
$2.81
($95.51 total for this fill)
5.72 L/100 km
41.14 mpg (US)
49.39 mpg (Imp)
2.43 gal (US)/100 mi
819.23 Wh/mi
Road trip. Filled with 95. Warm, clear, roof down, cargo rack behind car.
2022-12-29 541 km
336.16 mi
32.63 L
8.62 gal (US)
7.18 gal (Imp)
290.49 kWh
$2.86
($93.32 total for this fill)
6.03 L/100 km
39 mpg (US)
46.82 mpg (Imp)
2.56 gal (US)/100 mi
864.14 Wh/mi
Road trip. Filled with 95. Warm, clear, roof down, cargo rack behind car.
2022-12-27 533.4 km
331.44 mi
28.6 L
7.56 gal (US)
6.29 gal (Imp)
254.77 kWh
$2.49
($71.21 total for this fill)
5.36 L/100 km
43.84 mpg (US)
52.69 mpg (Imp)
2.28 gal (US)/100 mi
768.68 Wh/mi
Road trip. Filled with 95. Warm, clear, roof down, cargo rack behind car.
2022-12-26 599 km
372.2 mi
32.99 L
8.72 gal (US)
7.26 gal (Imp)
293.86 kWh
$2.55
($84.12 total for this fill)
5.51 L/100 km
42.68 mpg (US)
51.27 mpg (Imp)
2.34 gal (US)/100 mi
789.52 Wh/mi
Road trip. Filled with 95. Warm, clear, roof down, cargo rack behind car.
2022-12-24 163.3 km
101.47 mi
8.96 L
2.37 gal (US)
1.97 gal (Imp)
79.87 kWh
$2.68
($24.01 total for this fill)
5.49 L/100 km
42.81 mpg (US)
51.51 mpg (Imp)
2.34 gal (US)/100 mi
787.13 Wh/mi
Short fill. Filled with 98. Warm, clear, roof down, spirited local driving.
2022-12-19 537.8 km
334.17 mi
32.95 L
8.7 gal (US)
7.25 gal (Imp)
293.19 kWh
$2.59
($85.34 total for this fill)
6.13 L/100 km
38.41 mpg (US)
46.09 mpg (Imp)
2.6 gal (US)/100 mi
877.37 Wh/mi
Filled with 98. Mix of city and spirited local driving. Often rainy.
2022-12-02 551.6 km
342.75 mi
33.32 L
8.8 gal (US)
7.33 gal (Imp)
296.56 kWh
$2.74
($91.3 total for this fill)
6.04 L/100 km
38.95 mpg (US)
46.76 mpg (Imp)
2.57 gal (US)/100 mi
865.24 Wh/mi
Filled with 93. Mix of city and spirited driving.
2022-11-25 536.2 km
333.18 mi
28.44 L
7.51 gal (US)
6.26 gal (Imp)
253.09 kWh
$2.91
($82.76 total for this fill)
5.3 L/100 km
44.36 mpg (US)
53.22 mpg (Imp)
2.25 gal (US)/100 mi
759.62 Wh/mi
Filled with 98. Mixed highway and city driving. Used for a road trip.
2022-11-19 534.23 km
331.96 mi
28.81 L
7.61 gal (US)
6.34 gal (Imp)
256.46 kWh
$3.11
($89.6 total for this fill)
5.39 L/100 km
43.62 mpg (US)
52.36 mpg (Imp)
2.29 gal (US)/100 mi
772.56 Wh/mi
Road trip. Mostly driving at 100-110kph. Heavy rain. Varying altitude.
2022-11-18 585.49 km
363.81 mi
33.01 L
8.72 gal (US)
7.26 gal (Imp)
293.86 kWh
$3.05
($100.68 total for this fill)
5.64 L/100 km
41.72 mpg (US)
50.11 mpg (Imp)
2.4 gal (US)/100 mi
807.73 Wh/mi
Road trip, mostly driving at 100-105kph, increased in altitude approx 1500m. Mostly heavy rain. Filled with 98.
2022-11-17 370.39 km
230.15 mi
21.14 L
5.58 gal (US)
4.65 gal (Imp)
188.05 kWh
$2.82
($59.61 total for this fill)
5.71 L/100 km
41.25 mpg (US)
49.49 mpg (Imp)
2.42 gal (US)/100 mi
817.08 Wh/mi
Short fill. Tank was on 95RON. Mostly spirited local driving. Next tank is approx 50-50 95 and 98.
2022-11-06 531.08 km
330 mi
33.72 L
8.91 gal (US)
7.42 gal (Imp)
300.27 kWh
$2.55
($85.99 total for this fill)
6.35 L/100 km
37.04 mpg (US)
44.47 mpg (Imp)
2.7 gal (US)/100 mi
909.91 Wh/mi
Filled with 95. Possibly overfilled tank. First full tank with diffuser and underbody panels. Mostly leisure driving, often spirited.
2022-10-24 498.5 km
309.75 mi
32.16 L
8.5 gal (US)
7.07 gal (Imp)
286.45 kWh
$2.86
($91.98 total for this fill)
6.45 L/100 km
36.44 mpg (US)
43.81 mpg (Imp)
2.74 gal (US)/100 mi
924.78 Wh/mi
Filled with 98. Mixed city and highway driving. Lots of spirited driving.
2022-10-12 290.56 km
180.55 mi
16.91 L
4.47 gal (US)
3.72 gal (Imp)
150.64 kWh
$2.95
($49.88 total for this fill)
5.82 L/100 km
40.39 mpg (US)
48.53 mpg (Imp)
2.48 gal (US)/100 mi
834.34 Wh/mi
Work trip. Driving mostly 100kph, through the rain, with the car heavily loaded.
2022-10-12 534.03 km
331.83 mi
31.34 L
8.28 gal (US)
6.89 gal (Imp)
279.04 kWh
$3.039
($95.24 total for this fill)
5.87 L/100 km
40.08 mpg (US)
48.16 mpg (Imp)
2.5 gal (US)/100 mi
840.91 Wh/mi
Work trip. Driving mostly 100kph, through the rain, with the car heavily loaded.
2022-10-08 515.31 km
320.2 mi
32.57 L
8.6 gal (US)
7.16 gal (Imp)
289.82 kWh
$2.97
($96.73 total for this fill)
6.32 L/100 km
37.23 mpg (US)
44.72 mpg (Imp)
2.69 gal (US)/100 mi
905.12 Wh/mi
Mixed city, highway, and spirited driving. No longer being used daily. Filled with 98.
2022-09-27 530.16 km
329.43 mi
32.71 L
8.64 gal (US)
7.2 gal (Imp)
291.17 kWh
$2.97
($97.15 total for this fill)
6.17 L/100 km
38.13 mpg (US)
45.75 mpg (Imp)
2.62 gal (US)/100 mi
883.86 Wh/mi
Filled with 98
2022-09-19 494.67 km
307.37 mi
32.34 L
8.54 gal (US)
7.11 gal (Imp)
287.8 kWh
$2.97
($96.05 total for this fill)
6.54 L/100 km
35.99 mpg (US)
43.23 mpg (Imp)
2.78 gal (US)/100 mi
936.33 Wh/mi
Filled with with 98. Mostly rainy. Commuting to work.
2022-09-11 524.61 km
325.98 mi
32.24 L
8.52 gal (US)
7.09 gal (Imp)
287.12 kWh
$2.98
($96.08 total for this fill)
6.15 L/100 km
38.26 mpg (US)
45.98 mpg (Imp)
2.61 gal (US)/100 mi
880.79 Wh/mi
Filled with 98. Weather mostly not rainy, a bit warmer - 15ish most days. Lots of canyon driving.
2022-09-01 469.65 km
291.83 mi
28.91 L
7.64 gal (US)
6.36 gal (Imp)
257.47 kWh
$3.04
($87.89 total for this fill)
6.16 L/100 km
38.2 mpg (US)
45.89 mpg (Imp)
2.62 gal (US)/100 mi
882.26 Wh/mi
Mostly city driving, some highway, some canyon carving. Filled with 98. Weather mostly cloudy and cool, some rain.
2022-08-25 554.06 km
344.28 mi
33.06 L
8.73 gal (US)
7.27 gal (Imp)
294.2 kWh
$2.879
($95.18 total for this fill)
5.97 L/100 km
39.44 mpg (US)
47.36 mpg (Imp)
2.54 gal (US)/100 mi
854.54 Wh/mi
Filled with 98. Driving was approx 25% city, 25% spirited canyon carving, 50% 100kph country roads with a strong crosswind (~50-60kph).
2022-08-17 499.55 km
310.41 mi
31.47 L
8.31 gal (US)
6.92 gal (Imp)
280.05 kWh
$2.909
($91.55 total for this fill)
6.3 L/100 km
37.35 mpg (US)
44.86 mpg (Imp)
2.68 gal (US)/100 mi
902.19 Wh/mi
First full tank on new engine tune. 100% city driving. Rainy and wet ~40% of the time. Filled with 98.
2022-08-06 481.04 km
298.9 mi
30.71 L
8.11 gal (US)
6.76 gal (Imp)
273.31 kWh
$3.059
($93.94 total for this fill)
6.38 L/100 km
36.86 mpg (US)
44.22 mpg (Imp)
2.71 gal (US)/100 mi
914.39 Wh/mi
Later half of tank is first with new tune. Weather generally bad, rain and wind. 100% city driving, up and down the hill to Wellington, plus city traffic.
2022-07-29 420.33 km
261.18 mi
26.78 L
7.07 gal (US)
5.89 gal (Imp)
238.26 kWh
$3.059
($81.92 total for this fill)
6.37 L/100 km
36.94 mpg (US)
44.34 mpg (Imp)
2.71 gal (US)/100 mi
912.24 Wh/mi
Filled with 98. 100% city driving, often windy and rainy, coldest part of winter. Lots of short trips, a few spirited high RPM drives.
2022-07-19 458.67 km
285 mi
30.4 L
8.03 gal (US)
6.69 gal (Imp)
270.61 kWh
$3.38
($102.75 total for this fill)
6.63 L/100 km
35.49 mpg (US)
42.6 mpg (Imp)
2.82 gal (US)/100 mi
949.51 Wh/mi
Tire pressure at 40PSI half of the tank, then 44PSI. A bit of rain, temperature mostly 10-15c.
2022-07-07 537.74 km
334.14 mi
32.56 L
8.6 gal (US)
7.16 gal (Imp)
289.82 kWh
$3.48
($113.31 total for this fill)
6.05 L/100 km
38.85 mpg (US)
46.67 mpg (Imp)
2.57 gal (US)/100 mi
867.36 Wh/mi
25% highway driving (averaged 47.3mpg), 75% low speed city driving. Filled up with 98RON.
2022-07-01 431.1 km
267.87 mi
26.48 L
7 gal (US)
5.82 gal (Imp)
235.9 kWh
$3.29
($87.12 total for this fill)
6.14 L/100 km
38.27 mpg (US)
46.03 mpg (Imp)
2.61 gal (US)/100 mi
880.65 Wh/mi
Baseline tank. Untouched tyre pressure. 95 RON (91 AKI) fuel. 120kg / 265lbs of junk in the car. Entire tank was driven with the top down. Climbed to 825m / 2700ft.

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