I overinflate my tires by 9-10psi (running at 53.5psi right now) because it reduces rolling resistance, though some say it changes handling and braking. Lots here run over-inflated tires. IMHO it is a great free mod. Mine have been running this way for about 8 or 9K miles without even a hint of trouble. Use your own judgement, but that's my personal experience.
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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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