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Old 10-06-2022, 12:49 AM   #14
LikeLakes
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If you truly are interested in your mpg, you need to hand calculate it like ITD said early in the thread. None of the onboard readouts are accurate, and in my experience are always slanted toward the high end, meaning if your dash says 25, you are probably getting 23 or 24 actual.

When I was really interested in accurate mpg numbers, I'd calculate over a series of tanks, maybe take 2 fillups before doing the calculation. That eliminates factors like one day caught in stop and go traffic lowering your mpg or one day with an unusual amount of 50 mph cruising raising your mpg.
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