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1998 Honda Civic DX (modified): 55-60 psi measured at home with my gauge in daylight but when tires have not been driven yet. Purpose is to stay at least 10 psi above sidewall even in cold weather conditions (when pressure inside tires will drop) and even after weeks not checking. Go much more than 10 psi over max sidewall and the FE gains are not at great.
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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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