toe is the cause of the tire wear in the rear not camber. The stock spec of about -1.8* of camber is not much at all. Most newer cars run about this much in the rear. The problem comes when you add +.2* of toe per side. Toe is the rolling equivalent of dragging a tire sidewise which is obviously bad for wear. You can run up to 3.5* of camber with little affect on tire wear if you rotate somewhat frequently and run 0* of toe.
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