Towing a 68 on car dolly

I have a 7.3 Ford available, but geez, probably gets about 8 to the gallon. I have to go from Eureka, Mo to Rogers, Ar. Then to Ft. Wayne, In. and back to Rogers.

I'm just a couple hours south of Fort Wayne, if you run into trouble and need help in Indiana, hit me up.

And good gawd man, I knew them fords sucked but geez. My 05 Dodge Ram 3500 6 speed Cummins averaged 23.4 on the trip to Ohio and back Saturday, usually get about 17 towing the fifth whee camper. And I run 80-85 mph