My 08 rubi got 20 plus at 65 but I drive more like 75 most of the time and it would average about 17mpgs. With 35s, stock gears and an auto trans I still get 16mpgs at 75. I do live in LA (lower Alabama) to the roads are flat.
92 XJ 6 1/2 RC lift plus 2in BB, 35x12.5 Mud Rovers m/ts Aussie front D30 and Powertrax locker C8.25 rear, Rusty HD steering, RC control arm drop brackets, Nates rear bumper, HD SYE, YJ brake lines, Transfer skid plate, Nates slim line front bumper, Smittybilt XRC-8 winch, converted A/C to onboard air, Rino lined Floor boards
06 TJ stock gone
08 JK Rubicon 3in Zone lift, 35x12.5x17KM2s 1.5 wheel spacers, Super Chips programmer