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May I summarize and see if any or all of you think I have a reasonable understanding of an implication of this discussion? Here it is: if a modded car such as mine runs higher than OEM spec psi in the tires and with less weight load on them than manufacturere had planned, then the deflection will be less than the engineers expected when designing the odo and speedometer. Add to all that uncertainty the fact that I am running tires different than the OEM tire. All that might explain my repeatedly observed approx 1.29% undercount in distance travelled relative to GPS.
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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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