As long as you adjust your speedo for the change in tire size, you won't even be able to tell the difference.

 

Thanks guys

 

Yeah, I went from stock Sahara tires to the exact same size Duratracs, mileage was maybe 1-2 less, but I also added bumpers about the same time so that probably didn't help.

 

It's not a Prius. The only thing you really need to worry about is smiles per gallon.

 

It's funny how it worked out for me. My Jeep was getting 17ish on the stock 225's(according to the computer), then I added 275/70r18 Terra Grapplers and hand calculated a 14.5 average. Now with 35" KM2s I get 16 average. Makes no sense, but I'm not complaining lol.