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Tire manufacturers will typically say higher pressures will give better life, lower pressures will give better traction (up to a point, of course).
The flexing of the carcass where it contacts the road creates heat and wear. The lower the pressure the more the carcass flexes and the more heat and wear you get.
That's why a tire at low pressure, in hot weather, on the hwy, will overheat and blowout.
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