Aside from the cupping, my tire wear has been very even. My mechanic told me that Subaru Suspensions tend to work best with tires that have a rounded shoulder area (like Michelin Pilot) rather than a square shoulder like many of the newer tires. When I think of it. I ran my origional Potenza's until they were almost bald and they were even all over. They had a round shoulder. I've always had the dealer spec used for alignment, run a pound or two higher than the spec on the door and rotate every 7 - 8000 km.
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