Well, my experience with Coopers ended yesterday. Had 22,500 miles on 'em and they got real noisy in the last of couple of months. Tread wear was wearing evenly on all 4 tires. They gripped well in the wet and in the snow...just couldn't get over the humming that developed. So, approached Discount Tire where I bought 'em and they gave me a $400 adjustment (mileage) on a new set of Michelin Latitudes. Mounted, stemmed, balanced and TPMS set for $500.00. 65,000 mile tread warranty. Size of the tires old and new are 255x60R19's. Did have the front end checked out and Chevy Dealer tech said the noise is the tires. Results of this swap, smooth and QUIET. Nothing money can't fix, eh?
Jim
In God We Trust!