Xcel on cleanmpg has had his tires at 55+ psi for years now. I got to see them a couple weeks ago. Completely even wear across the tread, with some tread depth left (4/32-5/32). And that's at 96,000 miles on 60,000 rated oem tires.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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