Wouldn't know if gas mileage changed because I put the 2.5in level and tires on when I bought the truck, only took it for a test drive stock. I'm averaging anywhere between 11L-14L/100km's. Actually better then my 2013 Tacoma TRD sport I traded it in on, wasn't impressed with its mileage.

 

Hello,
Just signed up myself. So 2 months ago I bought the BFG KO2 285/75/r18 and they are awesome. More aggressive look. A little taller and wider. I have a 2011 ford f150 super crew completely stock with stock 18 rims. No lift, no leveling and they run perfect. No rubbing. No cutting of plastic. Nothing. They fit right on the rim and truck and are a great deal from the dealership. In fact tires not nearly as cool were 2 to 300 more everywhere I went. Run them at 45 to 50 psi for everyday use and they are pretty comfortable. Still a tad more ruff then the stock tires but what do you expect with a larger more aggressive tire. Love mine. Go 285 and you will be fine.