What is the fuel economy, or UNeconomy, on a "C".

Being that you are in Northern California you have mountains to contend with much like here in Washington State 8 to 10 would be good. I have a 26' Class C with the 8.1 Vortec running about 11,500 weight. I get 8.8 to 9.5 depending on where I go and how fast I drive. I would think that if you get 8 to 10 you should be happy. I plan on 9 and the difference between 8 and 9 on the 5200 mile trip we have planned this summer is about 57 gallons of gas or just 1 tank. I can live with that.