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I've had pretty good luck with the Kumho's so far. I'm at 30,000 miles of the advertised 80,000 mile lifespan. I rotate them every 7,500 miles and keep the pressure up.
The only instance where I tire has bubbled on me (cheap or expensive) has been when the tires were not balanced regularly. In high school (I was stupid and careless) I drove on an unbalanced tire until the shaking made it almost impossible to drive. When I took it off, there was a bubble the size of a football in the tire, and wires showing on one side!
Thanks for all the replies everyone. I've decided to stay at 45 psi for a few tanks and then bump it up to 55 psi for a few tanks. If I see a significant difference then I will decide at that point.
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