31" pro comp mud terrains

Pro comp has the buy 3 get 1 free deal on their tires starting in march so im going to look into gettin some pro comp mud terrains. I have a non-z blazer and i have seen and heard of many people running 31x10.5 bfg all terrains with stock suspension, and i was looking on the bfg and procomp websites and the 31"x10.5" bfg AT's have and overall diameter of 30.7" and the 31"x10.5" procomp mud terrains have an overall diameter of 30.2" so do you think that the procomp mud terrains will fit on my non-z blazer, im using the stock rims, i dont mind some minor fender trimming, and i plan on cranking the tortion bars a little before i get the new tires on. What are you guys thoughts on this?

What are your thoughts about fuel economy.

not really worried about that, if i was i would have put that in my post

Just making sure, because with bigger tires you will lose some economy.