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I have had 4 blowouts in 13 years on my pickup. Two were Firestones and went for no apparent reason, the other two had some kind of damage such as a nail that cut the sidewall or a sharp rock puncturing the tread.
The only time I replaced tires before they were worn out or flattened was when I got a set that two of them would go severely out of round above 65mph and rattle the truck rather violently. They were rated for 50psi, I kept them at 45. It cost me an additional $300 in repairs because of the vibration. That was the last time I bought cheap tires.
Typically I run them till they start dry rotting, or the tread gets down to the wear markers.
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