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I have over 30,000 miles on my tires at 50psi as well (labeled as 44psi max), and they are dead even wear as well, I ended up getting two of them replaced recently after running over some nails and bolts in the road, plugged the tires, inflated them to 50psi again and drove another 2,000+ miles before I got around to replacing the tires, they did just fine with plugs in them at that pressure, other then a slow leak and a little bump where the 3 plugs were, but that bump was there even at the lower pressure.
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