MPG for Various Class A Motorhomes

Just got 7.4mpg on a 625 mile trip from FL to the NC mountains. No toad....33' National RV SeaBreeze Ford gasser.

Al

Wow, this makes me not what to upgrade. I have a 99 P30 30" fleetwood. I get about 9.5 mpg not towing and 7mpg towing my 6600lb cargo trailer.

99 DP 8.3 Cummins pretty much 8 MPG 60-70 MPH going back and forth from West Virginia to Florida. No toad.

1996 Fleetwood Southwind 35', 460 with full Banks kit (headers, intake, transcommand), US Gears dual range auxiliary trans, 5.13 rear end. 6 - 6.5 MPG @ 60 MPH with generator running, 5.0 MPG through the Rockies.

ppine wrote:
10 mpg sounds more like a pick-up and is wildly optimistic.

Yeah, RVers are like fishermen when it comes to bragging about the size of fish they caught or the MPG of their motorhomes. I get 6.7, so there.

Just got back today from 700 mi trip towing a Smart car behind 36ft Monaco with 8.3 Cummins 1/2 inter state rest US highway mostly level with 7500 diesel Onan running the whole time. 60--65 mph. Got exactly 7mpg. Checked it a couple of years back and got about the same.

I only trust a computer with averages, over a long period of time.
Human brains have too many variables mixed in, for getting a true number.
Over 11yrs and as the third owner, my digital readout is now at 6.2 and it took 2 yrs. of my driving habits for bringing it up, from 6.1 and we tow also.
And, I still don't know if it's counting the fuel used by the genset, but most likely no and with the info coming from the engine's ECM.
Can anyone add to how this is calculated?
Unless there's a leak or other problem, MPG are the least of our concerns for cost of ownership, with one of the most expensive, being depreciation per mile.
Maybe someone should start a thread for that, since there are many that address MPG.
In the case of our coach, it looks like the first two owners averaged an expense of $4.54 per mile of depreciation alone. Naturally, the first one, who bought it new, suffered the most.

Ole B wrote:
For anyone who is interested, the heavy trucking industry has stated that since 2009 diesel engines now are getting .2 MPG better mileage per year. This would mean if a engine was getting 6MPG in 2009 in 2019 that same HP engine will get .2 x9 or 1.8 MPG better mileage. Also keep in mind you also now must use DEF.

Didn't do well with math in school but does that mean a truck getting 6 MPG would get 7.8 MPG with today's engine?

I have a 2007 Discovery and usually travel with a toad or a 24 ft car trailer and honestly 7 mpg is a normal figure some days less and some days more all depending on the wind. The Cat engine seems to have a sweet spot at about 68-70 mph but also uses more fuel. I always look at it as I have bigger fish to fry than my MPG. One day I had a strong tail wind and I got 11.5 MPG . Maybe I should use that one day figure when I quote my MPG.;)

Acasinocat wrote:
Please chirp-in and give me a yell, if you have a 2004 to 2007 Fleetwood Discovery, Fleetwood Bounder, Winnebago Journey or Itasca Meridian, and let me know what you get for gas mileage. Please let me know the length of your vehicle, too.

Thanks,

Mark

I plan on starting at my cabin this year, it is at 8000 elv. going done hill for the summer I hope to get close to 18 mpg.