E350 vs E450 chassis pros and cons for a short 24 ft class C

Bea PA wrote:
We now have a 24V on the E350 Ford chassis, only complaint is that there is not enough knee room for my husband. We have towed our almost 4000 lb Saturn Vue on short trips and our Goldwing trike on a trailer thousands of miles. We get the same gas milage as back in 2000 when we had a 32 ' class A

Hi Bea, it seems like a lot of people I talk to say the same thing. I get on average 8.6mpg with my 33ft Class A 454 TBI and thought folks with small C's would do better but most report about the same. Do you drive faster in a C because it is smaller,front end being less aerodynamic?