6 to 7k is average for the stock IRC's...
Most decent tires do better... Shinko, Kenda, Dunlop will go double that...
Metzlers will go a lot further, but they have too deep a tread... you'll have a huge flat spot from 16k on... plus they'll probably dry out and be unsafe unless you ride over 8k a year...
My rears wear out a lot faster than the fronts...(the lightweight torquemonster likes to scrub off tread)..
My current fav is the Shinko 712'S... nice meat, good sticky, lower unsprung weight than most... I expect 8 to 12k... and they're pretty cheap...
My Dunlop's were good when I bought them, but they seemed to harden up after just a couple years...
I have a Kenda on the front,.. it's okay but not as pretty as the Shinko..
... and pretty tires,... so important... right?...
Darn right it is...
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