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My Buick lesabre I ran 50-60PSI year round in 35psi tires, I had roughly 40000 miles on them and they were still in good shape (cheap tires too)
My cobalt being new I keep at or slightly below the rated sidewall most of the time with the rear up to 52psi in a 44psi tire, front I keep at or below.
Cheers
Ryan
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