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The pressure rating on the side of the tire is more to do with what type of car the tire is going to go on rather than anything different with the tire construction. Different sizes of the same model tire will have different ratings.
High mileage tires will almost always be "aa-a" or "a-b" tires because of the tread compound.
My opinion? Of the 4 cars i have increased tire pressure on, i never kept them above 45 psi cold. The impact on fuel economy and treadwear is minimal above 38 psi.
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