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Bill, what was I supposed to do with the mileage I noted in step 2?

oops... I forget. I hit upon this scheme while traversing Iowa and I may have been breathing the ethanol fumes.

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How about setting the bike up straight (level) and filling to the top of the inside ring every time you fill up? Then the figures would be consistent.

Yeah, well, there is that method but hey, I'm a math geek and I liked the elegance of my solution.