20.2MPG from Dallas to Colorado Springs when new (kept it under 70). Now getting about 21.3MPG. I run in Eco mode on the highway and keep it at 75MPH or less.
Very impressed with the power and the MPG versus that of the Wrangler the Bronco replaced.
23 BD Sas 2dr 2.3L: 2900 miles, DFW to Abilene to Ouray to Estes Park and back, 360 w/several hours off roading several days, average 18MPG in normal, rock crawler mode and Baja a touch. I tend to drive slower (65-70 max) and use cruise control (really helps) and premium, but did do some 75mph on the way back. I also have the Ford ProCal tune.