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 only hazard is the fool that don't know there is a slow lane over there in the right. And in how many states are you obliged to go 55 when towing. My old Dynasty w/ 450 hp would run 90 all day long in Texas but when I hit CA it was back to 55 because I was towing. I have seen min speed 0f 40 some places but the last I knew we all paid for those roads and if you hit someone going slower than you like guess what, ITS YOUR FAULT!