The Z ships with summer performance tires. These Bridgestones or Yokohamas are made to grip well, not last long.
15k on a set of rears is normal. You may be able to stretch it a *bit* past 20 with all highway use.
The fronts can last a little north of 30 with highway use.
When replacing these tires, look at the treadwear rating of the tires you own, then compare it with the rating of others that are available. The higher treadwear tires may not grip as well, but you'll get more mileage out of them (and, they'll most likely be a bit cheaper).
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