Fuel economy on Thor Super C

UPDATE - Again, Sept 14, 2013, Drove from Houston to Bolivar for a Saturday wedding, NO PLACE TO STAY, :( Oh yeah, I will stay in my new Super C. Drove great and did great. Fuel economy showed 9.6 mpg and I only used the front tank for travel. I used the back tank for the gen. The generator ran great and I only used the rear air after the sun went down. Water heater (propane) was quick and did great, great shower pressure and just really nice to have my own place to stay. FYI - Do Not allow the ice maker to run while driving down the road, reason - after ice dumps, water runs into the holes to freeze, but before THEY freeze, they are fair game for splashing and getting water/ice on the shelf. Hummmmm, learned something. Emptied the tanks and it was once of the easiest that I have EVER done. One hatch on left side, connect the hose, pull one then grey, done-quick. My daughter was able to watch a DVD during the drive since all 3 TV's and frige run from the inverter so ONCE my solar panels are installed, LOOK OUT FOR MORE OFF GRID STUFF (except for a/c ~ and this "IS" Texas) :)

You can see one of my trips at - http://www.youtube.com/watch?v=9mHClCu5ojU&feature=c4-overview&list=UUaAxi__Q-SDHwfgR7kzsjqQ