[onewhippedpuppy]

Originally Posted by Dan J

Was the alignment done with the car lowered?

This is key. The alignment needs to be done by a good alignment shop at the ride height it is actually driven at. Make sure your shop knows what they are doing, all alignment shops are not created equal. Discuss your problem with the tech, it's possible they could reduce toe or camber settings in the rear to reduce wear. Does the GTS have more aggressive alignment settings than a standard Cayenne? If so, you might be able to have them align it to standard Cayenne specs for reduced wear. Just understand that may have to compromise handling for tire wear.