OEM odo miles displayed and gallons shown on fuel pump. I modify that with a GPS derived multiplier because my non-standard wheels, or OEM design on the car seems to create a miscount of the miles. If you calibrate your odo like that, use several longer trips (100+ miles) to reduce data noise. That's what I did.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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