So we have a 2008 GP GXP and it has 18X8 Front wheels and 18x7 Rear size

So first dumb question why smaller on the back the 18x8 will stick out to far??

And what is done about rotation of the tires?

Its just not done unless you buy 2 extra back wheels and use them on the front?

With out rotation what's the front tire life 10k to 14k I would think?

I am just wondering what you other GXP owners are doing about this no rotation or???