Class A fuel mileage

I have a 99 model 38' holiday rambler endeavor with the same engine as the one you're looking at.

It's a great engine and can get pretty good mileage. Mine gets 9-10 on the flats pulling a trailer. It gets a little better than 7 pulling a toad through the steep mountains of northern AZ at full throttle most of the time.

I would guess 6 to 10 MPG.
IMO, if you are truly concerned about fuel economy, you should probably not buy a motorhome of any kind. In fact, I do not believe "motorhome" and "fuel economy" should ever be used in the same sentence (even though I just did it. Twice!)!
I have had my coach for several years, and have logged every fuel stop in a book. I have never bothered to calculate the "fuel economy". IMO, it is an exercise in futility. I know it is atrocious, I don't need to prove it!
That doesn't stop me from driving the thing!
The floor plan is, IMO, much more important than any mileage concern. That is based on experience. I once had a Class A with a terrible floor plan. We lived in it for a while, but soon traded it for a rear bedroom unit. Much better!
Even though we are very happy with our gas couch, there are times when I wish I had looked for a diesel. Especially now that diesel fuel is about 6 cents cheaper than 87 octane unleaded!

we average 8 mpg in our 33' DP with toad.

39 foot American Dream (32,000 pounds)with a 325 HP Cummins pulling a 10,000 pound 28 foot trailer I get about 8 MPG

At 53,000 lbs. with a 500 hp engine, we are getting about 6.2 mpg pulling our 3,400 lb. toad.

MM.

As has been mentioned, "fuel mileage" and "Motorhome" should NEVER be used in the same sentence and or, even post. There is absolutely nothing in the design of a M/H that ENHANCES fuel mileage. They're all rolling KLEENEX boxes. In all reality, expect the stated 6+ mpg. And, as you, the OP stated, there's waaaaaaaay toooo many variables to even come close to accuracy. Our coach, an '04 Itasca Horizon 36GD with the C-7 330HP CAT, get's between 6 and 8, PERIOD.

It doesn't matter if I'm towing or not. All the "man made" control factors (i.e. tire pressure, fuel filters, engine oil and filter and anything else that could possibly effect any portion of fuel mileage) are all in top notch condition. The speed is kept constantly at 62 mph. I get lots of people passing me by but, no biggie. I get there when I get there.

But, I expect bad mileage. If I expected more, I'd travel in a diesel VW and get 50 mpg and stay in hotel rooms. But, we like our M/H and all that it has to offer. It is what it is.

My suggestion, for what it's worth, buy your intended RV, make it yours, and travel to your hearts content and don't worry about fuel mileage except to somewhat, calculate fuel costs per trip.
Scott

I average 42mpg with my setup....your mileage may vary.


32 with the car and 10 with the coach...:B...Dennis

43,000 miles over fuel bought, = 8.5 freeway all day between fuel stops = 10.7

There are to many factors in figuring MPG in an RV, i.e. running the generator to power house A/C, size of toad, terrain, etc. I have always wondered why RVers worry about MPG since they spent around 300K for a Diesel. FYI, I get approx 7-8MPG pulling a Jeep Liberty toad, running generator for A/C, etc with a 40' HR with a Cummins ISC 350.

Dismissing MPG questions is like saying, you own a house so why in the world would you try to keep your heating or cooling or light bill down? Houses are expensive, and the electric bill is just a small part of it. If you have to ask about your electric bill or insulation or stuff like that, you shouldn't own a house!

:)