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The treadwear/psi discussion has been had many times on this site (maybe in this thread already). Higher pressure is not going to unevenly wear tires at the center. Steel belted tires cannot flex like that along the tread and so they do not balloon under higher pressures along the center of the tread, as people think. Numerous folks on this website have tens of thousands of miles of experience at ten and 15+ psi over sidewall to demonstrate that fact, myself included. But lower pressure will cause more flexing along the sidewall when you're in motion. That flexing will building up heat in the tire and increase the likelihood of the occasional blowout.
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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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