I have 35x12.50x17 Nitto Trail Grapplers and a 2012 JKU with auto and 3:73 gears. I get about 17 on the hwy and 14-15 in the city but I've also added about 600-700 lbs over stock with bumpers, winch, etc. Jeeps use GPM instead of MPG
2012 JKU, 3.5" Rubicon Express lift, 35" Nitto Trail Grapplers, Pro Comp 17's, Smittybilt SRC rock rails, XRC front bumper with XRC8000 winch, Wurx rear bumper, and other stuff that's cool!!!