youth_cycler - <shrug>, I haven't a clue what the wear rate is. Horrible would be my best guess.
The only time I ever toss Sim tires on is with Arcade mode, just to spice it up a bit when racing with a buddy...
captainkirk - Ya, I was think about what cars are a little rough "out of the box". You can tweak virtually anything with enough time and energy... I've got the TT screamin' around pretty well now. But, again, out of the box, it's horrid.