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Old 08-18-2016, 05:07 PM   #15
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We have owned this rig for 5 years and it is avg. 8.6 mpg

HR 29 fks TT, 1 slide, Chevy Silverado, RVM 167
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Previous rigs..2 Pickup campers,2 TT's, 3 DP MH's
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Old 08-18-2016, 05:09 PM   #16
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Milage on a diesel may not be all that different from gas in the real world. However, when you consider all the variables the differences are quite large. Let's put it this way, your Motorhome weighs 50k lbs and gets 7 mpg but you could own a gas rig weighing 20k lbs and get 8. Which unit is getting better MPG? It's really apples and oranges.

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Old 08-18-2016, 05:22 PM   #17
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I'm in the mid 8's on flat land, mid 6's driving in the mountains.
Ben & Sharon
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Old 08-18-2016, 05:25 PM   #18
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I wouldn't say apples to oranges, both motorhomes and in this situation both class A

Gas I feel is affected more by speed. For those that want to go fast all the time like what someone stated +5 mph over the speed limit, a diesel will be much better.

I had a gas RV, bounder 38P, usually I would travel 70-75 mph except with ANY incline or headwind. Usually 6.5-7.5 mpg was the result. If there was a headwind or long hills where I would crest at 40 mph... Below 6mpg wasn't hard to do... Even traveling down to key west often times barely 6mpg was the result of 70+ mph, overpass inclines at a few mph headwind. My X Inlaws would just set cruise in their DP at 63 mph and get 8.1-8.4 mpg
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Old 08-18-2016, 05:37 PM   #19
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Originally Posted by rlott2k View Post
When I see " What kind of mileage???" I immediately think " you don't want to know".
My thoughts too. No matter what you spend on gimmicks, you are not going to go from 7 mpg to 10 or 12.
2011 Monaco Knight 40PBQ towing a Jeep JK Rubicon Wrangler
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Old 08-18-2016, 05:38 PM   #20
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I had an old Winnebago chalet gasser and at 60 mph I might be lucky to get 6 mpg pulling a 8k trailer from Cali to Idaho. My new to me DP gets 8.5 mpg with the cruise set at 65, needless to say I'm happy with that

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Old 08-18-2016, 05:55 PM   #21
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My 2008 ISB 300hp in my 38ft safari gets anywhere from 6.5-7.5 pulling our jeep. I usually run in the 70mph range.
Jake and Katie
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Old 08-18-2016, 05:57 PM   #22
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I was born, raised and spent my entire 73 years living in California and yes during my younger (pre rv) years, I was always over the speed limit and was very impatient with those who were no.

However, once I started tv'ing (back in the 70's) I found that driving at a slower pace relaxed my driving time and increased my mpg.....and as a side benefit, didn't have to watch out for CHPs anymore.

I think it is mostly a maturity thing.....slowing down as you get older and being more responsible for the lives of those with you and those sharing the road with you.

Driving a large 20 ton mh at 70+ not only will reduce your mpg significantly, it's also hard on the vehicle, your passengers, and increases your chances of being in an accident.

I get my best mpg (around 7.5 to 8.5 depending upon terrain/wind/traffic) at 60 to 62. I have traveled at 55 (CA speed limit when towing) and did not see any measurable increase in mpg.

The difference between a coach with a gas engine and one with a diesel...you need to remember that the gas engine is running at probably twice the rpm that that of a diesel engine and has about 1/2 to 1/3 of the torque for the same amount of horsepower.

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Old 08-18-2016, 06:12 PM   #23
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We're a 44 foot, 43,000 GVW DP powered by MaxxForce 10 405hp engine - pulling a 4,000 lb Jeep Liberty - and consistently average 6.5 mpg. Typically set the cruise control such that we're moving a hair under 65 mph.
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Old 08-18-2016, 06:13 PM   #24
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I have a 38' coach with a 360 hp Mercedes turbo diesel - Just returned from a 4,100 mile trip where I consistently get 9 - 10.5 at a sweet spot of around 62 mph....
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Old 08-18-2016, 07:00 PM   #25
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Expected fuel mileage for a Diesel Motorhome

Running at GVWR, 40' DS + toad, 35K Lbs, moving about 106 Lb/hp. Cruise @ 1600 rpm (~63 mph). Avg 7.5 mpg over four years, adjusted for generator usage.

John & Diane, fulltiming since '12 02 DS, FL, Cat330, '04 Element NHSO RVM103
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Old 08-18-2016, 07:32 PM   #26
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My wife and I just recently bought a new 2016 fleetwood pace arrow 38 ft with 340hp 6.7L isb cummins motor. We just got back from a 2 wek trip to NH and ME. Over 1000 miles there and back towing a jeep Cherokee. We averaged 9 mpg with average speed of 65 mph . I really expected better fuel economy, with all the new requirements on emissions. I understand it's a big square box on 6 wheels but with all the technology out there it seems that these engines should get better fuel economy.
Don't get me wrong I absolutely love our new motorhome but I would like to get better fuel mileage then 9 mpg.
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Old 08-18-2016, 07:50 PM   #27
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We have a 13/14 Itasca 35F with the V10. After 30 years of RVing I have finally taken the advice of some of my peers from this site and have stopped checking the mileage except for the first trip after taking delivery. With about 1400 miles on the OD at the start of a 2600, towing the wife's Focus on a dolly, we got just under 7.5 to 7.6 per gallon with keeping the Tow/haul engaged and cruise control normally set at 60 to 62. We started with a Toyota 4 banger that got 16 to 18. progressed to a full Class C with the early V10 and averaged 12 mpg. I'll take the comfort of the 35 footer and the second bath over going back to the 16 to 18 per gallon.
Stan, Shirley & 2 Schnauzers (Sandy & Sassy)
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Old 08-18-2016, 07:53 PM   #28
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Originally Posted by Larry Mac01 View Post
From a Motorhome with a Ford v-10?
Is there anything that can be done to improve it w/o invalidating the warranty?

Suck it up Buttercup, gas is cheap.

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diesel, fuel, motorhome

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