That depends on the overall condition of the vehicle and how you drive. However, based on my reading since joining FTE and also on my own experience with Ford's I6 you should get anywhere from 15 to 20 highway mpg.
My 81 4X2 RCLB F250 was stick. My brothers 79 F150 4X4 SCLB was an auto. Both got high teens.
Thanks for the quick response, I've got a 4.0 4x4 ranger and thinking I might like a SCSB with a six , mostly for the torque around colorado mountains then when on the hiway get about the same as my ranger.Just not sure about the stick for the torque , really like my auto.
My friend has a I6 in his bronco and he gets 14 city/18 highway, 20mpg seems kind of high but ya at best you would probably see that which is pretty good. But average driver that is pretty heavy on the take off and brakes I would say city 13-14 and highway 17-18