Auger, I think all things being equal, twins are harder on tires. The whole higher torque, low end grunt pushing the bike hard out of turns etc.
Perhaps it should be mentioned what bike we are doing this with, cause a R1 might eat a tire faster than a EX500. Just a thought.
My 900SS. 10,000 miles and I am about to replace the rear AGAIN. Bike stock comes with Michelin Pilot Sports, and I have been very happy with them. No plan on changing. I get about 7,000 miles out of the fronts. No wheelies, no burnouts.