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Old 11-17-2011, 10:00 PM   #15
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Cat C7

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Originally Posted by gaugeguy View Post
OK. One last query for this week.

What gets better mileage for a motorhome?
Curiosity is running rampant!

350 hp Cat C7 in a Fleetwood Excursion towing a Jeep Wrangler 4-down, 7.2 mpg over 15,000 miles, says former owner. My numbers are almost identical, after 6,000 miles.
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Old 11-17-2011, 11:41 PM   #16
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You left out one engine that is a real contender.... I have a 38' Berkshire with a Mercedes Turbo diesel and recently on a trip from Tampa to Texas (abt 1200 miles) I averaged 10.3 MPG at 62-65 MPH.... Almost made the entire trip on one tank of fuel (100 gallons) Also - engine has 1,000 lbs of torque which totally eats up the road... Buddy of mine has a Cummings and is getting 6-7 MPG... I text him often when we travel together letting him know what my milage is... His return texts aren't too friendly... lol...
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Old 11-18-2011, 12:27 AM   #17
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I got 11mpg in a 1986 27ft Winnie in the hills of western Pa. Kept speed to 55-60 and that's a 454cu engine. Suprised me I got that good because everyone I asked with the newer 454 gets around 8mpg. Might have something to do with extra emmisions and computers in newer models. Plus the fact that the newer models are built like a bus with the flat front end which has much more drag than mine with the sloped front.
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Old 11-18-2011, 01:47 AM   #18
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Sounds like most here are telling the truth!

Signature vehicle WORST 6.9, Best 9.1 Ave about 8
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Old 11-18-2011, 05:32 AM   #19
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Had the coach 6 years, ISC350 Cummins, gets 8 MPG on a road trip, uphill, downhill sideways or flat. We also do alot of real close 100 miles or less round trips, can't figure fuel mileage on that to much stop and go and idle time/generator time (.7 gal per hr) Just me but all the M/H's I owned get between 7.5-10mpg (except 1 1989 454 got 6mpg got rid of it quick). In reallity 1-2 mpg diff just is not a big deal, and if you figure the REAL cost per mile ( tires, fuel , maint, repairs, insurance, and depreciation) to run a M/H gas or diesel it will make you head hurt. In the end it's the cost of your fun.
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Old 11-18-2011, 07:35 AM   #20
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Not sure if you're interested in older info, but for what it's worth: 1996 Bounder 22K chassis (tag axle), actual weight about 19K, 460 motor with full Banks Powerpak, about 6.5mpg with toad and up to 7mpg w/o toad. Never saw any mpg improvement after installing the Banks, but think it was me using all that extra power. Used to run about 65mph when road conditions were appropriate. I was envious of V10s and Workhorse combos when they came on the market. On the other hand, if high fuel usage is a concern, then one probably should be driving an RV, anyway LOL.
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Old 11-18-2011, 07:50 AM   #21
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1999 34' MH with ISB Cummins with Allison 6 speed average over 50,205 miles.
10.238 MPG 55-62 MPH with toad around 26,000 lb.
All fuel bought is on a spreadsheet.

Before this one I had a 33' MH gas 454 that averaged 5.96 MPG at the same speeds. That was with a Banks exhaust system.
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Old 11-18-2011, 09:15 AM   #22
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im at 8 to 10 with a 97 holiday rambler endeavor w cat 275 towing a liberty to boot and im heavy on the foot !
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Old 11-18-2011, 10:20 AM   #23
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Notice a trend here that the MH with older diesels before the EGR systems got better MPG. Also I think they were lighter back then.
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Old 11-18-2011, 10:22 AM   #24
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Mine is a 32 foot class C. It is a truck based Ford F-700 conversion
It has a 5.9L 190HP Cummins-6speed(non-OD) manual trans- 3.70 gears
Weight is 13,500 MPG is 11.7 MPG at that weight. towing my Jeep on a trailer another 5700 is 10-10.5 MPG @ 65MPH
And towing @ 70MPH it drops to 9.5-9.8 MPG
I also have (2) 50 gallon fuel tanks so my range it quite good.

Mine also has NO EGR, DPF, DEF tank, Or COMPUTER!! I really like it that way.
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Old 11-18-2011, 10:38 AM   #25
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35' with the 454 staying at 55 mph. going to Mytle Beach ave. 10 MPG. Going to Cherokee ave 9MPG. Lightly loaded 2 people.
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Old 11-18-2011, 11:04 AM   #26
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This is rather like the question, "How high is up?"
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Old 11-18-2011, 11:08 AM   #27
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After perusing several other threads (which took some time) I can form the following opinions (I'm sure there will be numerous disagreements):

Thus far, it looks like both Cat & Cummins diesels from the 1990s have superior mpg. I had not thought of the Mercedes Turbo Diesel.

The GM/Allison Workhorse folks are all over the spectrum; anywhere from 4 to 9 MPG.

The one constant is the Ford Triton, which appears to be a constant 4-6.5 MPG. The 2010 and newer Fords may get up to 10 MPG, but I've not found enough data to sort through. Interestingly, not a lot of input from The V10 owners, but I’m sure more will respond unless this thread dies soon.

Having said all that, the real answer is to pick your year and floor plan regardless of the chassis. The less mileage on the odometer, the better.


Just my opinion.

Thanks all for your input!


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Old 11-18-2011, 01:16 PM   #28
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This is rather like the question, "How high is up?"
Actually, no, it is not. I wanted to get experiences from members.
If one does not have anything positive to add, then one should say nothing.

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