Tire wear is influenced by alignment. Someone who really really knows Porsches can set the car up for even tire wear. I replaced a set of Michelins PS2 p-RATED with another only because of the age of the tires. The wear was perfectly even. The guy who did the alignment set up P-cars for racing and had cars in the shop that proved it.
My previous tires wore unevenly and cupped( Yokos).
When I bought there were two tires with the same Model Name but only one was P-rated.
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