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Replaced my originals on my 2011 at 19k. Partly b/c the fronts were worn uneven from a bad alignment off the lot and the rears b/c they were nearly bald by then.
I replaced my factory tires at 35,000. I thought they should have done better. 21,000 is pretty bad. Do you have an alighment problem or have you done a lot of burn outs?
The factory tires generally blow - and they are also generally P metric tires. Go with a heavier duty LT tire and you will likely experience a better outcome.