You have to love these threads. If someone starts a post about fuel mileage affecting his decision to buy an RV, he gets jumped on and told if he can't afford the fuel, then he shouldn't consider RVing.
Then a thread like this comes along and many mention that they drive slow to save a few pennies on fuel. :B
I personally think that SOME just do not feel that they have the physical abilities to drive the speed limit so they use fuel mileage as an excuse to drive much slower. Nothing wrong with that but if you really are so concerned about fuel cost, than an Class A is not the way to go. :B