I have a 2007, 4 door, 4x4, long bed Cummins that is my DD. I can get 24-25 mpg on the highway and 18 city if I stay off the skinny pedal and keep it below 68 mph. Most small cars struggle to get the same results. I vote you get a diesel tow rig and DD. Stay away from any 6.0 Ford though.