I too am not all that aggressive and got about 10k km on my OEM rear tire and 16k km on my OEM front tire (Michelin Hi Sports). My rear tires life was cut short by a nail. I'm not aggessive in the corners, but I do like hard accelerating and braking. I changed the front out when I started to feel the cornering felt weird. Also the dealership told me you can run your hand against the grain of the front tire and if you feel alot of ridges then it is close to end of life.