I think the gas mileage in addition to your speed and weight has a lot to do with aerodynamics of your motorhome.
For example. I owned a 2000 Damon Intruder 36ft for 12 years and put over 85,000 miles on it. I averaged 7.6 mpg overall.
It was loaded to the hilt and I pulled a Suzuki Grand Vateria behind it. Last year I traded for a 2007 motorhome (33ft)
hoping I would get at least the same mileage. The new one is shorter and lighter,a little taller, but the front and rear cap is not as rounded
and aerodynamic as the Intruder was. I now get 6 to 7 mpg and still travel at a top speed of 60mph.
My driving habits have not changed, the V10 is newer, has a higher horsepower and in talking to other
owners with larger motorhomes some of which get much better mileage than I do ( and some worse) I think
a lot has to do with the aerodynamics of your coach.
