I have been shopping for Michelin Super Sport tires for my XFSC for a week or too. I am buying them from Costco. They are $335 each for the rears and $275 for the fronts. Costco only charges $14 per tire for install and certificates. They prorate wear based on the 30k warranty for road hazard repairs. This week only (until 10/7) when you buy 4 Michelin tires you get a $70 rebate.