Scotts, a heavy vehicle with no aerodynamics and a carbureted engine, I think you are right on the money with your mileage. Thats what bob tails did 60 years ago, and I don't see that they can do double that 60 years later. It will run a lot faster than 55, but you will get a lot of wind noise, fan noise and valve noise, but it won't hurt it any. But it will use more gas to break more wind.
