I recently noticed extreme wear on the inside 25% of my rear tires. I took some primitive measurements and observed that the Camber was at -2.1 degrees, and the toe-out was at 4 degrees - which is what the information I have says the tow-out should be. So it's obvious that these settings would wear out the inside edge of the rear tires. Personally I could not justify buying new tires since the current ones have lots of tread on 75% of the contact patch. You may think I'm crazy, but I took matters into my own hands and made some adjustments. I cranked the camber back to about -1.0 degrees, and this resulted in the previous toe-out going to a toe-in at about 0.6 degrees. I've noticed a very slight reduction of steering response, and very slight "step out" at the rear when going over certain bumps, but the car still drives very well overall. This weekend I plan on adjusting the toe-in to around 0 degrees which should eliminate the "step out".
A while back I took some flack (on the other forum) for even suggesting any deviations from the factory alignment specs. Feedback regarding rear tire wear was very inconsistent, some reported even rear tire wear while others reported very rapid rear tire wear. Since my QP is a daily driver, I am going to set it up for that as best I can. Okay....let the flaming begin....