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So then if I am at 2000 RPM and tire rack says my 13" Michelin Harmonys have 923 revolutions per mile and my fifth gear ratio is .702 and my final drive is 4.058, I should see the speedo at about 45.7 MPH (rounded). But the tire size calculator Ford Man posted says my tires should only turn 891 times per mile (not the 923 tirerack claims). And I have over inflated the tires anyway and therefore have probably reduced revs per mile somewhat. So I still am curious enough to measure as convenient. This formula will be really useful though, thanks!
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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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