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Fuel log graph
Efficiency log for: S-Spec - 1992 Eunos Roadster S-Special
  • Lifetime Fuel Economy: 27.3 mpg (US), 8.6 L/100 km, 32.7 mpg (Imp)
  • 90-day Fuel Economy: 11.2 mpg (US), 21 L/100 km, 13.5 mpg (Imp)
  • 3-tank Fuel Economy: 22 mpg (US), 10.7 L/100 km, 26.4 mpg (Imp)
  • EPA Combined Rating / % over rating: 24 mpg (US) / -53.3% (based on 90-day fuel economy)
  • Total fills: 35
  • Total fuel used: 315.39 gal (US), 1193.9 L
  • Total distance traveled: 8593.2 mi. / 13829.4 km
  • Average tank distance: 245.5 mi. / 395.1 km
Fill date Distance Fill amount Price Fuel Economy Details
2019-01-05 163.8 km
101.78 mi
34.34 L
9.07 gal (US)
7.55 gal (Imp)
305.66 kWh
20.96 L/100 km
11.22 mpg (US)
13.48 mpg (Imp)
8.91 gal (US)/100 mi
3003.14 Wh/mi
Odo at 158,003. Car has been off the road since early 2018. Poor economy likely due to some evaporation and starting and moving around at very low speeds now and then. Result anomalous.
2018-01-01 354.7 km
220.4 mi
27.15 L
7.17 gal (US)
5.97 gal (Imp)
241.63 kWh
7.65 L/100 km
30.74 mpg (US)
36.92 mpg (Imp)
3.25 gal (US)/100 mi
1096.32 Wh/mi
2017-12-23 203.47 km
126.43 mi
15.9 L
4.2 gal (US)
3.5 gal (Imp)
141.54 kWh
7.81 L/100 km
30.1 mpg (US)
36.12 mpg (Imp)
3.32 gal (US)/100 mi
1119.51 Wh/mi
2017-12-06 328.9 km
204.37 mi
29.4 L
7.77 gal (US)
6.47 gal (Imp)
261.85 kWh
8.94 L/100 km
26.3 mpg (US)
31.59 mpg (Imp)
3.8 gal (US)/100 mi
1281.25 Wh/mi
Colder weather and some time on the dyno can explain the small dip here compared to previous fills.
2017-10-20 456.2 km
283.47 mi
34.04 L
8.99 gal (US)
7.49 gal (Imp)
302.96 kWh
7.46 L/100 km
31.53 mpg (US)
37.85 mpg (Imp)
3.17 gal (US)/100 mi
1068.76 Wh/mi
2017-10-07 383.7 km
238.42 mi
31.14 L
8.23 gal (US)
6.85 gal (Imp)
277.35 kWh
8.12 L/100 km
28.97 mpg (US)
34.81 mpg (Imp)
3.45 gal (US)/100 mi
1163.28 Wh/mi
2017-10-07 364.3 km
226.37 mi
30.48 L
8.05 gal (US)
6.7 gal (Imp)
271.29 kWh
8.37 L/100 km
28.12 mpg (US)
33.79 mpg (Imp)
3.56 gal (US)/100 mi
1198.44 Wh/mi
2017-09-14 420 km
260.98 mi
35.51 L
9.38 gal (US)
7.81 gal (Imp)
316.11 kWh
8.45 L/100 km
27.82 mpg (US)
33.42 mpg (Imp)
3.59 gal (US)/100 mi
1211.24 Wh/mi
2017-06-15 463.7 km
288.13 mi
35.91 L
9.49 gal (US)
7.9 gal (Imp)
319.81 kWh
7.74 L/100 km
30.36 mpg (US)
36.47 mpg (Imp)
3.29 gal (US)/100 mi
1109.95 Wh/mi
2017-06-03 351.6 km
218.47 mi
30.46 L
8.05 gal (US)
6.7 gal (Imp)
271.29 kWh
8.66 L/100 km
27.14 mpg (US)
32.61 mpg (Imp)
3.68 gal (US)/100 mi
1241.77 Wh/mi
2017-03-26 313.8 km
194.99 mi
32.06 L
8.47 gal (US)
7.05 gal (Imp)
285.44 kWh
10.22 L/100 km
23.02 mpg (US)
27.66 mpg (Imp)
4.34 gal (US)/100 mi
1463.87 Wh/mi
2017-01-05 405.2 km
251.78 mi
34.95 L
9.23 gal (US)
7.69 gal (Imp)
311.05 kWh
8.63 L/100 km
27.28 mpg (US)
32.74 mpg (Imp)
3.67 gal (US)/100 mi
1235.4 Wh/mi
2016-10-22 302 km
187.65 mi
36.27 L
9.58 gal (US)
7.98 gal (Imp)
322.85 kWh
12.01 L/100 km
19.59 mpg (US)
23.52 mpg (Imp)
5.11 gal (US)/100 mi
1720.49 Wh/mi
Car has been mostly unused since the summer. Poor MPG is I suspect a combination of two issues - evaporation and running on slightly stale fuel the couple of times I've used it in that entire time, and the fact that a significant proportion of that tank was used on a track day.
2016-05-21 424.7 km
263.9 mi
35.42 L
9.36 gal (US)
7.79 gal (Imp)
315.43 kWh
8.34 L/100 km
28.19 mpg (US)
33.88 mpg (Imp)
3.55 gal (US)/100 mi
1195.26 Wh/mi
2016-04-05 444.5 km
276.2 mi
37.34 L
9.86 gal (US)
8.21 gal (Imp)
332.28 kWh
8.4 L/100 km
28.01 mpg (US)
33.64 mpg (Imp)
3.57 gal (US)/100 mi
1203.04 Wh/mi
2016-03-09 470.6 km
292.42 mi
39.15 L
10.34 gal (US)
8.61 gal (Imp)
348.46 kWh
8.32 L/100 km
28.28 mpg (US)
33.96 mpg (Imp)
3.54 gal (US)/100 mi
1191.64 Wh/mi
2016-02-24 264.85 km
164.57 mi
26.38 L
6.97 gal (US)
5.8 gal (Imp)
234.89 kWh
9.96 L/100 km
23.61 mpg (US)
28.37 mpg (Imp)
4.24 gal (US)/100 mi
1427.3 Wh/mi
Can you tell I'm not driving my own car very much?
2016-01-09 412.03 km
256.02 mi
38.71 L
10.23 gal (US)
8.52 gal (Imp)
344.75 kWh
9.39 L/100 km
25.03 mpg (US)
30.05 mpg (Imp)
4 gal (US)/100 mi
1346.57 Wh/mi
2015-11-29 413.26 km
256.79 mi
38.24 L
10.1 gal (US)
8.41 gal (Imp)
340.37 kWh
9.25 L/100 km
25.42 mpg (US)
30.53 mpg (Imp)
3.93 gal (US)/100 mi
1325.48 Wh/mi
2015-11-09 433.53 km
269.38 mi
37.14 L
9.81 gal (US)
8.17 gal (Imp)
330.6 kWh
8.57 L/100 km
27.46 mpg (US)
32.97 mpg (Imp)
3.64 gal (US)/100 mi
1227.26 Wh/mi
2015-10-20 360.6 km
224.07 mi
36.79 L
9.72 gal (US)
8.09 gal (Imp)
327.56 kWh
10.2 L/100 km
23.05 mpg (US)
27.7 mpg (Imp)
4.34 gal (US)/100 mi
1461.86 Wh/mi
2015-08-08 535.4 km
332.68 mi
37.67 L
9.95 gal (US)
8.29 gal (Imp)
335.32 kWh
7.04 L/100 km
33.44 mpg (US)
40.13 mpg (Imp)
2.99 gal (US)/100 mi
1007.94 Wh/mi
Can't really explain the high economy here, other than that my commute seems particularly un-taxing on the Mazda. I think I did a few longer trips at nearer 65, rather than 70-ish too. Either way, I never thought these cars were really capable of this sort of economy.
2015-07-31 435.5 km
270.61 mi
34.12 L
9.01 gal (US)
7.51 gal (Imp)
303.64 kWh
7.83 L/100 km
30.03 mpg (US)
36.03 mpg (Imp)
3.33 gal (US)/100 mi
1122.06 Wh/mi
2015-07-19 393.2 km
244.32 mi
38.78 L
10.24 gal (US)
8.53 gal (Imp)
345.09 kWh
9.86 L/100 km
23.86 mpg (US)
28.64 mpg (Imp)
4.19 gal (US)/100 mi
1412.45 Wh/mi
Track day on this tank.

Have also gone back and edited all previous entries to take account of my over-reading speedometer.

Note to self: Subtract 5.714% from all future distance numbers!
2015-07-08 485.4 km
301.61 mi
37.84 L
10 gal (US)
8.32 gal (Imp)
337 kWh
7.8 L/100 km
30.16 mpg (US)
36.25 mpg (Imp)
3.32 gal (US)/100 mi
1117.34 Wh/mi
2015-06-28 421.2 km
261.72 mi
33.23 L
8.78 gal (US)
7.31 gal (Imp)
295.89 kWh
7.89 L/100 km
29.81 mpg (US)
35.8 mpg (Imp)
3.35 gal (US)/100 mi
1130.56 Wh/mi
2015-06-22 438.1 km
272.22 mi
33.17 L
8.76 gal (US)
7.3 gal (Imp)
295.21 kWh
7.57 L/100 km
31.08 mpg (US)
37.29 mpg (Imp)
3.22 gal (US)/100 mi
1084.45 Wh/mi
Tank of 98, for the hell of it.

I should note the last three tanks have been on brand-new Dunlop Sport BluResponse tyres. The old tyres were in pretty bad shape, so it's too early to say whether my recent economy has been down to them or not, but it certainly doesn't seem to be harming.
2015-06-19 496.5 km
308.51 mi
38.32 L
10.12 gal (US)
8.43 gal (Imp)
341.04 kWh
7.72 L/100 km
30.49 mpg (US)
36.6 mpg (Imp)
3.28 gal (US)/100 mi
1105.44 Wh/mi
2015-05-27 395.7 km
245.88 mi
31.2 L
8.24 gal (US)
6.86 gal (Imp)
277.69 kWh
7.88 L/100 km
29.84 mpg (US)
35.84 mpg (Imp)
3.35 gal (US)/100 mi
1129.37 Wh/mi
2015-05-17 406.7 km
252.71 mi
37.18 L
9.82 gal (US)
8.18 gal (Imp)
330.93 kWh
9.14 L/100 km
25.73 mpg (US)
30.89 mpg (Imp)
3.89 gal (US)/100 mi
1309.52 Wh/mi
2015-04-03 347.4 km
215.86 mi
32.04 L
8.46 gal (US)
7.05 gal (Imp)
285.1 kWh
9.22 L/100 km
25.52 mpg (US)
30.62 mpg (Imp)
3.92 gal (US)/100 mi
1320.76 Wh/mi
2015-03-16 492.6 km
306.09 mi
37.94 L
10.02 gal (US)
8.35 gal (Imp)
337.67 kWh
7.7 L/100 km
30.55 mpg (US)
36.66 mpg (Imp)
3.27 gal (US)/100 mi
1103.17 Wh/mi
2015-03-08 515 km
320.01 mi
39.25 L
10.37 gal (US)
8.63 gal (Imp)
349.47 kWh
7.62 L/100 km
30.86 mpg (US)
37.08 mpg (Imp)
3.24 gal (US)/100 mi
1092.06 Wh/mi
Mainly freeway driving 65-70mph
2015-02-28 282.5 km
175.54 mi
27.23 L
7.19 gal (US)
5.99 gal (Imp)
242.3 kWh
9.64 L/100 km
24.41 mpg (US)
29.31 mpg (Imp)
4.1 gal (US)/100 mi
1380.31 Wh/mi
Mainly commuting
2015-02-10 448.8 km
278.87 mi
39.22 L
10.36 gal (US)
8.63 gal (Imp)
349.13 kWh
8.74 L/100 km
26.92 mpg (US)
32.31 mpg (Imp)
3.71 gal (US)/100 mi
1251.95 Wh/mi
First tank in the car since buying it. MPG may not be accurate yet - need to find the sweet spot for filling. May stop at the first click each time...

However, this will serve as a general indication. Maybe 2/3 of the tank was motorway cruising at 65mph ish, and the rest is commuting and a few blasts here and there.

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


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