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Great thread. My 2 cents: The heat comes from the flexing of the sidewalls. More pressure reduces the flexing and so reduces the heat buildup. More pressure also reduces rolling resistance which improves gas mileage. I have a 1-ton C30 with duallies. They are rated for 60 p.s.i. I have 42 psi in them now but after reading this thread will boost each to 60.
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