I don't know if they would assume hard driving, but I would assume poor maintainence since you are supposed to rotate the tires every 5-6,000 miles (every other oil change).
I put Yoko ES100s (215 50) and have over 20,000 miles looking for about 35-40 before another set. This is a better tire than the suspension. It works great everywhere except snow.
Just my opinion.
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