Continental limited warranty for original equipment tires:

http://continentaltire.custhelp.com/...459749&p_olh=0

Note: treadwear is specifically excluded in the General Exclusions section. If these tires came with your vehicle when new, you have no treadwear warranty.

Even for replacement tires, as Andrew stated, there are so many exclusions, that unless the tire is defective you'd rarely benefit from a treadwear warranty. Consider that most of us probably haven't rotated tires (side to side) on our Crossfires. Not rotating the tires every 6-8K results in any Continental treadwear warranty being voided. After 3 years, the warranty expires, regardless of the mileage. Even though Tirerack lists the tire as having a 60K treadwear warranty, Continental doesn't list the ContiTouringContactCW95 as having any treadwear warranty:

http://continentaltire.custhelp.com/...126249&p_olh=0

Continental only mentions the ContiTouringContact under its road hazard warranty which prorates treadwear and lasts only a year.

I wouldn't even bother complaining to Continental because unless you purchased the tires as replacements and have been rotating them frequently, you simply have no coverage. You should just ask Sears to match (or come close) to the Tirerack price if you want to get new tires there. If they can't find someone that will, or just buy the new tires from tirerack and have them shipped to your home or local tire shop. Even if you had a treadwear warranty and it was prorated from a price of $322, it wouldn't be much cheaper than Tirerack's price for a tire. And one other issue - to have all four tires prorated they'd have to be equally worn out with equal wear across the treads as well. Very unlikely.