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I understand it that there is a diminishing return beyond 40psi (44max) tire pressure, so I just keep mine at 38 figuring the pressure goes up to 40ish when driving. I've read where the pressure rating is ultra conservative, meaning they can handle a lot more, but to me it isn't worth the worry. There is a big gain from 32 to 40, I'll take that and be happy. Plus, I figure if I get too much pressure, the ride quality will start to really go down.
It's just my opinion on it, certainly not gospel, and I'm not that passionate about it.
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