I've noticed people get wildly different mileage with the same tire. Here's what I've gotten so far on rears:
Conti Trail Attacks...12k+ miles
I've noticed these style dual purpose tires have a deeper tread which may be giving higher mileage, they just start out with more rubber. The street tires I've used on my SV650 and Aprilia usually last 8k miles, except for the Michelin Pilot Road 3 which gave me over 10k miles.
2009 Wee Strom ABS (current)
1987 Harley Low Rider Sport (current - with 205K miles)
2009 Aprilia Mana 850, 2006 SV650, 1984 Yamaha Virago 1000 (all sold)
Silver Strom Club Member #11
Wee Farkles: Russell Day Long Seat, Madstad with Moose Adventure Shield +4'', SWMotech Centerstand, 1'' up & back bar risers, Givi XS308 Tankbag, Aprilia mirrors, Framesliders, Fenda Extenda, Elka Shock.