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You ask a very, very common question. The Metz has quite a reputation for being short-lived. The average is around 5000 miles with some as low as 3000 and a few getting as high as 9000 or more (how they do it is a mystery). Right now your choices are the stock Metzler or you can fit an Avon Cobra which is even more expensive.
Now an alternative that many Rocket Captains have done is what we call going to the Darkside, as in fitting a car tire to the Roc. There is an entire Forum dedicated to this. I have close to 4000 miles on my Riken Raptor 225/55ZR16 and it still looks brand new.
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