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Air pressure, alignment or wheel spin. Over inflated tires tend to wear in the center. Under inflation tends to wear both outer edges evenly. Poor alignment tends to wear inner OR outer edge. What are your expectations? My car rarely sees straight line highways and spends a lot of time in the canyons. 5000 miles on a set of PS2 rears is typical for me.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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