What kind of clearance do you have between the tire and the upper control arm?I also have 285/70R18s on mine, toyo at3s on the stock wheels powder coated satin black. I didn't have the truck long before I swapped but i'd say its a 2-3 mpg hit from the stock territory MTs. Much more quiet ride though and I still get 22-23mpg back and forth to work with the LZ0 on mostly backroads, getting around 15mpg pulling a 4.5k lb boat. Didn't notice any different throttle response between the tires.
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