OK friends. I've read fuel mileage for a 35' gasser with the v-10 Ford engine pulling a 3500 lbs toad will be anywhere from 4 to 9 mpg. This is average traveling, not all level and not all hills. ...
The faster you travel the faster the gas disappears! Keeping speed 55 to 60 will help! We have big block Chev chassis and get 8+. Fords do not get good mileage.