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When calculating average fuel economy, you divide the total gas used into the total miles driven. This is equivalent to averaging the inverses of the miles-per-gallon figures for each leg of the trip, assuming the legs are of equal length.
So say the trip was 30 miles. 99.9 mpg means 0.3 gal was used. On the return, 16 mpg means 1.88 gal used. Total = 60 miles / 2.18 gal = 27.5 mpg.
If you directly average mpg you could get infinite fuel economy just by coasting a bit with the engine off.
Posts in this Thread:
- Your best gas mileage? 40.83 last night, Railhead , Sun, 21 Jan 2007 10:15:33
- Re: Your best gas mileage? 40.83 last night, Richard Scott, Tue, 23 Jan 2007 21:13:17
- Interesting to have a controlled, SeeVTSaab, Mon, 22 Jan 2007 13:21:57
- Re: Your best gas mileage? 40.83 last night, Stargazer, Mon, 22 Jan 2007 01:38:14
- Basically downhill at fairly low speed..., Noel, Sun, 21 Jan 2007 19:04:16
- Re: Your best gas mileage? 40.83 last night, Jim Kane, Sun, 21 Jan 2007 10:22:35
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