Rumour has it that Boxster rear tires just don't last (I'm guessing due to the tons of negative camber). I had heard consistently 15k miles out of the rear tires.
That being said, mine are almost-new, and I have put 7k on them so far. I fully expect them to last quite a bit longer than 15k. But I drive like an old lady most of the time. :-)
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