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Originally Posted by GoGogebic
Its usually off by 6-7 mpg.
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That happens frequently.
My average is also off by that amount.
I've found the displayed average is further off when using hypermiling techniques.
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I'm building a car called the Gogebic XP and I want to build in a mpg tracking system.
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If you plan on using a commercial OBD2 compliant engine, you could get it with all the engine attributes, including the OBD2 stuff, then you can tap into that.
If you don't get an OBD or OBD2 compliant engine, I wouldn't bother and spend the time in getting it on the road rather than logging the fuel use.