I have a whole thread devoted to the calibration of my odometer against the transmission and tires sizes. In my current set up and my previous I repeatedly measured significant undercounts in miles on the odo. My current arrangement with a 1993 transmission, 1998 gauge cluster, and 175/70-r13 tires I have repeatedly measured an average approximate 2.9% odo undercount. That's my finding.
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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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