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Through repeated tests with a GPS app and google maps over significant distances, I find my new 15" wheels with 175/70-R15 tires on gives a 9% undercount on the odometer. I tested a defined section of the route to El Mirage from my home. Measuring 100.7 miles on the OEM odometer, the GPS showed 110.76 miles. I'm gonna call it 9% to be conservative. Speedometer is another story. Very odd since speed and distance use the same sensor mounted on the transmission.
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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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