Sorry a typo; 13600 miles. Bought it with 10600. Any advice on tires? I am taking it to the Audi dealer because it grinds as I come to a stop. Really weird, other than the tread blocks on the P6's suck.

 

When you say grind when you stop.. you mean the breaks?
In addition to having my wheel bearings replaced, I now have all-season (less expensive) contis - that have been like a dream. I live in MD and they were good in the snow - and because of the harder compound- they have worn less quickly and are very quiet. The car may not stick as well to corners when coming off ramp quickly - but I don't often take sharp turns at 80moh anyway.... Maybe stay away from the sport tire, have your rotors and wheel bearings checked out. You should still be under factory warranty.....