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I call Hooey on that theory. Never had a blowout(or sidewall bubble, or a flat) with close to 30,000 miles @ 90psi on the original GY E-rated Marathons with 5er at close to max gross weight of ~16k lbs. Kept a close eye on pressures with a TPMS, as I think under inflation is the biggest tire killer. Curb hopping and road hazards are big on the list too.
When they aged out(still had plenty of tread), I upgraded to GY G614's just for the extra margin of load range and a little more peace of mind. I run the G614's @ 110 psi always. If I notice any excessive wear on the center of the tires I will reduce the psi, but so far so good with about 6k on the new tires.
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