Hint, it's not the roads, it's the heavy throttle and brake application.
never hammer the throttle, not my style, never stuff the brakes either. decent pace the rest of the time.
roads are rougher shape, south west Wisconsin mostly.
another c14 rider and i were on the same group ride. he said that he rode hard and got great tire life. (this happened twice, great guys, very nice) i asked him if he rode like that all the time, he said he never takes twisties like that but rides hard.
heh
the majority of guys i ride with are sport bike guys, their mileage in on par with mine. not sure if that says anything.