real world mileage, diesel vs gas

chadk66 wrote:
Am contemplating an early to mid 2000's Class A. Will be pulling an 18' enclosed trailer. Am leaning towards a diesel pusher. Dealer is trying to tell me a gasser will get as good a mileage and as good a power. I'm a diesel mechanic and I'm not buying it. What are some real world mileages and performances out there on both.

He's most likely correct, except that most of the DP's are a lot bigger and a lot heavier. If fuel is a real concern and I don't know why it would be, keep in mind that diesel fuel usually costs more.
Biggest concern with traveling costs and not what you were asking, is depreciation per mile, so picking the right used coach can go a long way in this regard and make it seem like you are getting free fuel for years on end.