Hmm... seems a bit excessive. I have a 35d with the 336 wheels and OEM run flats. 18 months and 18,340 miles later I still have decent tread left. I think I can milk these to 23,000 miles. I do have outer edge wear on the front tires but that's normal from what I've been told and seen. I drive pretty aggressively I'll admit. Maybe you should have someone else take a measurement.
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