Quote:
Originally Posted by motordavid
Doing the arith of miles driven divided by gallons over those same tanks full will give a more real world mpg, for those specific tanks full. The real number and the OBC may be close, or not.
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I'm not sure I agree with this. This method of calculation assumes the amount of fuel you're adding to the tank is the same amount of fuel consumed. There's no way to be certain it is and, I suspect, it's not.
I spent a fair amount of time trying to get the computer to match the hand calculations. And I was never able to do so when calculating MPG between fill-ups. Over time the two came closer together. I suspect that's because the average eliminates the variances.