Other factors especially inportant that were not talked about. My coach does not move when a truck screams by. It is stable in the cross winds till they reach about 50 mph. Then I will feel a bit of pressure. I climbed up to the Eisenhower Tunnel at 50 MPH but did not over heat and the best part is I can come down with my retarder and not worry about the mountain hills and brakes. The flats make the gas and diesel discssion pretty easy but you hit the mountains and the down hills especially and you wll see a difference. Also you can see a difference if you have it properly set up. My Foretravel is a dream to drive andholds the road with a finger on the wheel. You can even take your hands off and it will drive true but I do not do that very often, only after the last alignment to check for a bit.
I will say that both will get you there and the CCC in my coach is about 7000 pounds of stuff I can put in there.