I purchased a set of Cooper Zeon 2XS tires for my 2002 Corvette on 7/3/07, at the time the car had 25, 929 miles on it.

The 2 back tires were 275/40ZR/18 and cost $175.95 each.
The 2 front tires were 245/45ZR/17 and cost $120.95 each.
The total bill for all 4 installed on the car was $781.29.

All 4 tires were wore out completely when the car reached 35, 196 miles on 8/27/09.
This is only 9, 267 miles.
The car is meticulously maintained, including tire pressure, and hardly ever driven over 60-MPH, no fast starts, or fast stops to account for the wear to the tires.
When I questioned the installer about it, he said there was no mileage warranty on them, so they could not be prorated for a refund.