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I do not get six years from my tires.

Why would years matter? Would it not depend on how many miles are driven? And under what driving and road conditions?

Yes, although if we were analyzing wear over time, when they get old (like dry rotted) they wear faster because they turn into dust much faster.

True, but people shouldn't be driving on them at that point anyways.

I have experienced the opposite. They hardened and took longer to wear.