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sycamore, is your actual mileage calculated by miles driven/amount of gas to fill the tank? If so, there are several sources for uncertainty and error, particularly if you are only using a small part of the tank. It's better if you keep track over a whole tank, or even several tanks in a row, and try to fill always to the same point (this is easier with a motorcycle than with a car), at the same time of day, same station, etc. for consistency.
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