I must say I got my money's worth and then some with my old tires. Close to 12 years!
Just got back from having all four tires replaced and a new wheel with one of the old tires mounted on it for a spare (wasn't too bad, will be fine in a pinch for now). They also balanced the tires, never heard of this before, but kinda made sense to me.
Feels good to have new tires. Oh, the simple joys in life for me!