I need some opinions guys

I'm in the market for a reg cab 4x4 taco with the 2.7l 4banger.

My question is how wide and big of tire could I clear with maybe just a simple level and a ad a leaf in the ass end?
I don't want the truck sky high and I really don't want the upsize in tires to rape the mpgs.
I need help for experience. Please comment.

 

235 85 skinnies might fit with a spacer lift. I bet you wouldnt lose any mpgs and perhaps gain one with them inflated like crazy.

 

you could clear 285's with little trimming. i'm running 265/75r17's and only had to remove front mud flaps and very minor trimming. i'm up 2.5 in the front and 1.5 in the back...

 

I've got 3" of lift in front and an AAL in back and am running 265/75/16s with no trimming. Tire size is not much more than stock but it's beefier and doesn't make much of a difference in MPG either.
Edit:
My MPG is above average though because of some exhaust mods and a URD O2 simulator. When air temp is 60-85 I average just over 25 MPG with my 2.7l.