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Old 11-28-2011, 04:57 PM   #22
Mik Ohki
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Join Date: Nov 2005
Fan#: 29868
Location: Three Rivers, MA
What I Drive: 2012 Frosted Glass SE w. SFE

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Originally Posted by fanoftheliving View Post
Is that calculated or based on the average readout on the dashboard? The reason I ask is that my car is incredibly inaccurate. On my last all highway trip the average MPG was reporting 40.2, but hand calculated came out to 35.8 - which is nowhere close. My experience has been that the average MPG readout is inaccurate.
You need to reset the meter in the car occasionally, I usually do it on every tank. Fuelly calculates the same as you would by hand and I would imagine weighs those averages based on gallons consumed and miles traveled, so a 400 mile trip based average would count something like 4 times more than if you filled up after only 100 miles.

That is just my guess. I also think I read Fuelly bases it's number on only the last ten fill ups, but I am not positive about that. I'll look at the FAQ later.
2012 Frosted Glass SFE (9/1/11-current)
2003 Pitch Black 2.3L Focus SE (RIP 2/19/04-8/17/11) (261,503 miles)
2000 Twilight Blue 2.0 Focus LX (RIP 6/10/01-2/7/04)
1987 Light Blue 3.8L V6 Thunderbird (RIP 6/17/01)
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