real world mileage, diesel vs gas

JetAonly wrote:
I logged 20k miles at 8.3 mph without a towed. Its about 7.6 with 5k miles of a 6k towed. I pull Eisenhower west bound tunnel at 28mph. It is 9% at 11000 ft at the approach to the tunnel. Total weight is about 39,000lbs. I normally run 68mph on the cruise…but I digress.

Unless you start running 50-110k miles a year fuel mileage is a red herring and you focusing on one of least important aspects of Class A ownership. Some B motor powered MH have 5k tow restriction. You will never see 12mph as a long term average. You don't say how much your trailer will weigh. The other concern is every hill you go up you, have to come down. You will need and exhaust or Jake brake, or a transmission retarder.

for all intents and purposes it's really flat where I'll be running. The trailer will only weight 5-7K I would suspect. just a light 18' cargo with a couple motocross bikes and a little gear and tools. Nothing real heavy. As a couple stated on here they can push close to 10 mpg with a cummins. And those I'd assume are stock. I should be able to make twelve with that same setup with injectors and a chip. I'm not concerned with the transmission they are built to withstand far more than I would be asking for it to do. We are making pickups put out 600 hp with stock trannies with no issues and pulling 40' toy haulers with them. I just like the idea of having everyone under one roof so they can move about and eat going down the road. I honestly don't care if I get better mileage than a gasser, it'll just be fun to try to see how good I can make it in that regard.