Running an almost stock JKU and put 33" Toyo Open Country tires on the stock wheels as I didn't have any desire to start messing with lifts and such-like. I have driven from Maryland to Nevada, into Death Valley and come back through south Texas twice this year. Saw a slight decrease in mileage and that's it. No other down side. Mostly drove highways, obviously, but did several trails in Nevada and Texas. Had no clearance issues. Having done that twice, I won't do it again but will spend my time driving on sand at Assateague Island. These same tires work great there also, even though the tread is a bit aggressive for soft sand. I also do a lot of camping in North Central PA and western MD and have had no tire or clearance issues in the woods, on the trails. Anyhoo, for what I do, the 33" works great.