2008 Unlimited, 3.8L auto, 3.73, Superchips, heavy Pitbull tires true 35", OD Off most of the time average 17-18mpg. With 35" Duratracs the average was 18-19mpg.
Tire weight can play a major roll in mpg.
08 Black and Khaki JK Sahara Unlimited, Dual Tops, MyGig, Tow pkg, Trax-Lok Rear Diff,
Mods -- 3.5" Rock Krawler front springs, 2.5 TerraFlex BB, PitBull Rockers 37x12.50x17 on ProComp 7069 alloys, AEV Premium Bumper,