Recently, I started getting an alert that my rear tire wear was excessive relative to the front tires. I have the Michelin AS4's with about 15k miles on them and I have plenty of tread still on the rears. The manual says to left/right rotate the tires for best wear and to reset the tire setting to make the alert go away. I did the reset so I'm not getting the message any longer, but should I really be rotating them on the same axle? I've never done that with staggered wheels before.