Fuel economy on Thor Super C

UPDATE - I purchased the Thor Super C, diesel with the 6.7L engine. The engine is quieter than my old V10 and so far mileage is running 10mpg. I like the extra power and the larger cab since it uses the pickup truck cab and not the van cab. Also, my wife likes the larger cab since the passenger seat in my old Class C was very small. I have not put a lot of miles so far but will try to post as I have more info. So far, this is a much better coach than my previous Freelander Gas rig. I plan on adding solar panels to help during the day with the house-type frig and the inverter. It does have an auto start gen for when batteries are running low with the frig and the inverter. Thor stated the gen runs off the front 25 gal tank which is wrong, it runs off the larger, back, 40 gal tank. This unit drives kind of like my F450-dually-pickup truck. Drives great, better than the old one. Jer in Texas - off grid-lots. :)