Approximate fuel milage of these 2 motorhomes?l

All things being equal I would take the diesel.

Basically, if your worried bout the fuel mileage you can’t afford it.

Keith

Had a Fleetwood expedition with the 5.9 Cummins. 68 MPH always got 10 plus. Now 45’ tag Discovery with 450, 6.4 the best so far

Having a 2012 F53 with the V-10 and getting 6mpg towing a 13 Explorer. The 460 F53 will not be much less in mileage, less HP yes, but not mileage. Not by much anyway!

We have the 5.9 in a 40' coach, always drive with full water of 80 gallons and always do the 70 mph speed limit on the interstate. Even with a good head wind the lowest we have ever gotten is 7.9 the most 8.9.
We had a 32' V10 we drove the same and mileage was between 5.5 to 7.5, it was all over the road, a rough ride and a screaming engine that put out so much heat we often had to drive with the genny and the roof A/C on. Once stopped the heat from the drive shaft would heat the floor from engine to the rear wheels, even with both A/C's on it was hard to cool the interior down.
Happiest day was trading in the 2014 and buying the 2007 diesel. Granted with an older coach there are things to update. However its a joy to drive, we talk now no more shouting, no more jarring bumps.
Just my 2 cents.

Tal/IL wrote:
Here is our experience with 3 class A m-homes. I keep a log of fuel usage, and fuel mileage is averaged over several thousand miles for each. Fuel usage does include some generator run time:

33' gasser with 454 engine @ 16,000 lbs max - 8 mpg
35' gasser with V10 engine @ 22,000 lbs max - 7+ mgg
40' diesel with 400 HP Cat C9 @ 31,000 lbs max - 6.4 mpg

We may be a long way from guidance for the OP.

Pretty hard to compare an older (much lighter)coach with 5.9 liter Cummins B with a heavy 40' with 9 liter meeting much stiffer EPA requirements.

I promise you, a reasonably driven reasonably light coach with Cummins B can get 10 MPG on level and 9 in hills. Want to drive 70 MPH? NO WAY to get 10 MPG.

Here is our experience with 3 class A m-homes. I keep a log of fuel usage, and fuel mileage is averaged over several thousand miles for each. Fuel usage does include some generator run time:

33' gasser with 454 engine @ 16,000 lbs max - 8 mpg
35' gasser with V10 engine @ 22,000 lbs max - 7+ mgg
40' diesel with 400 HP Cat C9 @ 31,000 lbs max - 6.4 mpg

If I could have found a handicap diesel coach that is what my gasser we have today would be. Diesel chassis just seem to ride and handle better to me.
Long distance traveling, give me a diesel any day.
We have crossed the country several times in a diesel and mileage varied. Had a 300 Cat engine and on one trip across, east to west, we got great mileage 12+ . Same coach, engine same towed we got just a bit better than 5. Difference? We drove into a strong headwind all day long.

That ol 460 is about as bad as it gets for fuel mileage. You can count on 7 MPG @ 62 MPH. On the other hand, I have read reports on the 5.9 getting 9-11 MPG.

Richard

aswagerty14 wrote:
We are choosing between 2 motorhomes and it is coming down to fuel mileage, does anyone know about how many mpg these 2 would get and would the difference be significant enough to make it the decision maker? Holiday rambler diesel 5.9 L or Fleetwood pacearrow gas Ford 460 both on 37 ft class a's. I know the diesel will get better fuel mileage but by how much? Thank you!

While I agree that MPG is not at the top of the "why to buy a coach" list, there WILL BE a significant difference in MPG between a Cummins B and the old Ford 460 in a heavy coach.

I would venture that the heavy gas coach (37') would use about 40% more fuel.