I have owned a lot of motorhomes and here is how they turned out. I put it on the scales and hjow I travel is 38,200ish. Fully loaded this unit tops out at 42500 lbs. They Are 195/75-22.5 on aluminum Alcoa wheels. Had us double checking our math !!! Each time it comes out the same. We have checked this on three diferent occasions as people don't believe it. With generator running both a/c units on and the wife cooking it looses about 1 mpg. In any event I drive around 67 - 68 mph in low side of power band and get 9.5 miles per gallon without the generator and all water/holding tanks empty. I just didn't feel it was worth the risk as the semi who decided not to let me pass was not up to the task. Talking 95+ and wasn't at max revs and showed no disposition to not get to full governed rpm. I'm not sure of the final gear but it will scare you on an open road. Has a six speed 4020 Allison heavy duty trans. There is no EGR and it does have a computer so it is a celect. It has a Cummins M11 red top rated at 450 HP. Hello, I have a 1997 40' Holiday Rambler Navigator with a single rear axle. MPG of RV 40wds2 Holiday Rambler 450hp 1997
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