9.5 mpg towing our Jeep Liberty, 10.5 mpg when not
Figures given are 4000 to 5000 mile trip averages
Influential Factors
Highway speeds average 65 mph
Notable generator usage naturally lowers my averages
2007 Ford E350 with gas 6.8L-V10 engine
2007 Phoenix Cruiser model 2350, 23'-8" long, 9'-10" to top of a/c and aerodynamic
RV weight on trips is just under 10,000 pounds
Jeep Liberty weighs 4300 pounds
As shown below in my signature
I suppose I could drive 55mph with a tail wind for a one hour get-away to a remote location, turn on my gas generator for the weekend and drive back home just to average One MPG.