I'm lamenting the same situation. My rears die a slow death from chunking and the front wear down like crazy in a taper towards the inside edge. I'm wondering if that's normal, or if the 2 degrees of negative camber on the fronts is doing it. When the tires are fresh I love the way the car handles.
Purple rears and orange purple fronts might last longer. But can a stock sedan go as fast with them?
Anyone know what sort of changes in setup should be made when you run a harder tire? Do you alter spring or shocks?