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All that, and more.
I record all my gas fillups (not the $, since I can't control that) and keep notes about where I have the cam timed, which octane I'm using, etc. It all goes into a master spreadsheet along with maintenance records.
Due to seasonal use of AC (6 months of the year in Phoenix area) and seasonal changes in gas formulations, I look at both overall gas mileage by fillup as well as averages by month over several years. The biggest difference I've found so far was when I put in a new oxygen sensor a couple of years ago.
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In God We Trust. Everyone else, keep your hands where I can see them.
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