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Originally Posted by jglaz
Hi folks, I've been driving my '06 FEH for a few months now, and something I'm noticing is that the on-screen MPG indicator is nearly always higher than the actual.
My latest tank *looked* great - 34.6 MPG on the display, but I was rather disappointed to see a calculated 31.9 MPG when I did the math based on mileage and actual gallons. This difference has always been there, but for the latest tank (and my current one also) it appears to be even larger.
I'm starting to think I should enter my mileage data based on on-screen MPG instead of the actual mileage/gallons - I'd be further up the list. 
Does anyone have any hypotheses on why there's a difference between the on-screen and calculated MPG? |
I was wondering that myself.... I used my calculated amount in the database, although I would LOVE to use the display MPG!!
I was pretty much at 36 MPG the whole first tank, although someone had mentioned that at 0 MTE they still had 1.5 gallons left. So I set up a spreadsheet, adding my current trip reading to the miles to empty, then dividing by 13.5. At the end of my first tank, my estimated MPG was very close to my calculation after filling up, 33.5 to 33.1, and that might have been because they topped it off.
Fred