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06-23-2013, 05:48 PM
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#1
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Senior Member
Join Date: Dec 2012
Posts: 257
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Your best mileage, class A diesel.
Just curious, I hit some great mileage on my last trip and created quite a stir. Are there other members getting better than 9 mpg (national average) in their class a diesel. If so, what mileage did you get and what driving habits possibly attributed to the mileage.
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"Mrs. CC. Magna" 36' 1993 Country Coach, Magna, 300hp Cummins, 5 speed Alison trans, #5016
127,000 miles and counting...
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06-23-2013, 06:06 PM
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#2
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Senior Member
Country Coach Owners Club
Join Date: Dec 2010
Posts: 7,752
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My average is 8.7 but on a tank while running through WY I got 9.4. This is with a ISC hauling 32,000lbs.
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06-23-2013, 06:12 PM
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#3
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Senior Member
Monaco Owners Club
Join Date: Mar 2011
Location: Almond, Wisconsin
Posts: 1,512
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Fueled coming out of Montana went across ND to MN to WI with about a 40 mph tail wind and got 12mpg. Never seen it since, I usually run into a head wind and get 7.5 to 8.5. As they say, you got horses you got to feed them hay. Jim
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2006 Monaco Camelot 40 PAQ 400ISL - Toad Jeep Grand Cherokee - DW is the Nagivator. Retired to travel and everything revolves around the price of diesel.
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06-23-2013, 06:13 PM
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#4
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Senior Member
Join Date: Dec 2009
Location: North Texas
Posts: 1,061
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I think my DP is a freak. The previous owner swore up and down that he got 12mpg. I didn't believe him, and I've never seen twelve (I have a heavy foot), I believe it is possible.
The best I have seen is 11.15 mpg. That was in a 2500 mile trip to Orlando and back. The key on that trip was I had favorable wind conditions both going and returning.
I don't always check my fuel economy, but the worst I have seen on any given trip was 8.9mpg. That was fighting a monsterous headwind and running the generator.
BB
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06-23-2013, 06:17 PM
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#5
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Senior Member
Newmar Owners Club
Join Date: Feb 2012
Posts: 1,519
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In as much as this is a topic of interest to most Class A owners, I do not think one can generalize this. Yes, it depends on one's driving habit, driving conditions, air pressure in the tires; to name a few, but it also, to a greater degree, is a function of type of Class A; for example, a King Aire with 600 hp dp would get substantially less miles per gallon than a 300 hp, 35' dp.
It is great that you are getting 9+ mpg on your Class A. I wish I could say the same about my Essex with 500 hp, over 40K lbs. and I do not expect that either!
Respectfully,
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2008 Newmar Dutch Star 4304
2005 HR Navigator 45PBQ - SOLD
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06-23-2013, 06:52 PM
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#6
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Senior Member
Official iRV2 Sponsor
Join Date: May 2011
Posts: 8,305
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Quote:
Originally Posted by srh
In as much as this is a topic of interest to most Class A owners, I do not think one can generalize this. Yes, it depends on one's driving habit, driving conditions, air pressure in the tires; to name a few, but it also, to a greater degree, is a function of type of Class A; for example, a King Aire with 600 hp dp would get substantially less miles per gallon than a 300 hp, 35' dp.
It is great that you are getting 9+ mpg on your Class A. I wish I could say the same about my Essex with 500 hp, over 40K lbs. and I do not expect that either!
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X2, fuel economy in both diesel and gas powered vehicles is largely a function of weight. It's a physics problem; it takes energy to get something moving at a particular speed and the energy required is directly proportional to weight. Add to that all the factors noted above and what results is a complex problem.
Here's a link to a very good paper by Caterpillar relating some of the key parameters that govern fuel economy in Class A RV's: http://weisstravels.com/resources/CA...er+reduced.pdf
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Joel (AKA docj)--
RV Technology Specialist
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06-23-2013, 08:16 PM
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#7
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Senior Member
Newmar Owners Club
Join Date: Feb 2012
Posts: 1,519
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Very Informative Article!
Quote:
Originally Posted by docj
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Thanks for providing this very informative article!
Regards,
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2008 Newmar Dutch Star 4304
2005 HR Navigator 45PBQ - SOLD
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06-23-2013, 08:50 PM
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#8
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Senior Member
Join Date: Dec 2012
Posts: 257
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Quote:
Originally Posted by docj
X2, fuel economy in both diesel and gas powered vehicles is largely a function of weight. It's a physics problem; it takes energy to get something moving at a particular speed and the energy required is directly proportional to weight. Add to that all the factors noted above and what results is a complex problem.
Here's a link to a very good paper by Caterpillar relating some of the key parameters that govern fuel economy in Class A RV's: http://weisstravels.com/resources/CA...er+reduced.pdf
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X2, yes thanks, most is over my head but very informative.
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"Mrs. CC. Magna" 36' 1993 Country Coach, Magna, 300hp Cummins, 5 speed Alison trans, #5016
127,000 miles and counting...
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06-23-2013, 09:00 PM
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#9
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Senior Member
Newmar Owners Club
Join Date: Jan 2012
Location: Polk City, FL
Posts: 3,368
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Mass and velocity
My college Mechanical Engineering professor said mpg was only related to mass and velocity.
I had a 95 HR Endeavor 35 FT (26,000lb) with a 230HP 5.9 Cummins pulling a toad and I consistently got 10-12 mpg. The smaller motors work harder but seem to get better mpg.
Same toad, pulled by my 2002 40 ft (30,000lb+) Monaco w 330 HP I got 8-10 mpg.
Same toad, pulled by new 43ft 2013 Entegra (40,000 lb) w 450 HP Cummins I get 7-8 mpg.
I'd be curious to know what the Prevost folks get with a big Detroit Diesel and their weights. My guess is the mileage bottoms out around 6-7 mpg.
Of course winds and hills are big factors but I can edge my mpg up 1-2mpg but just driving slower at 62-65mph.
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Dave & Debbie
2021 Newmar DutchStar 4369
2016 Ford Edge&2019 Ford F-150 toads
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06-23-2013, 09:03 PM
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#10
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Moderator Emeritus
Join Date: Jan 2007
Location: Litchfield Park, Arizona
Posts: 10,530
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I sure wish I had one of those freak DPs that got high mileage.
Over 50,000 miles, through all kinds of terrain, towing a Ford Explorer... I averaged just over 7.3 mpg. That's in a 40DP w/400ISL. I usually drive just under 65 mph.
I've only made a couple of short trips not towing and my best guess is 7.9 mgp w/o toad.
Rick
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Rick, Nancy, Peanut & Lola our Westie Dogs & Bailey the Sheltie.
2007 Itasca Ellipse 40FD
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06-23-2013, 09:07 PM
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#11
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Dec 2010
Posts: 730
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I had a 2000 Winnebago Journey 36' with a 5.7 Cummins that I got 10.2 MPG driving across country. I then had a 2000 Fleetwood Discovery 37' with the Cummins 5.9 that gave me only 7.4 MPG. I am currently driving across country in a 2006 Itasca Meridian 36' with a CAT 350 that is giving me 7.7 MPG. I drive constantly at 60-62 MPH.
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06' Itasca Meridian 36g with CAT 350
2011 Jeep Wrangler 4-door
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06-23-2013, 09:37 PM
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#12
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Senior Member
National RV Owners Club Florida Cooters Club Freightliner Owners Club
Join Date: Mar 2013
Location: Salt Springs, FL
Posts: 453
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Quote:
Originally Posted by bobioknight
Just curious, I hit some great mileage on my last trip and created quite a stir. Are there other members getting better than 9 mpg (national average) in their class a diesel. If so, what mileage did you get and what driving habits possibly attributed to the mileage.
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I participated in and followed the thread where you reported getting 17+ mpg. I'm glad to see you are still here and cannot wait for your next trip report. Call me a cynic or skeptic but I still believe something is wrong with your mileage report.
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Jack & Beverly
1999 National Tradewinds 7371; Cat 3126; 6 Speed Allison; 7.5 KW Onan; MS-2012,
2014 Jeep Patriot on a EZE Tow
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06-23-2013, 09:54 PM
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#13
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Senior Member
Join Date: May 2012
Posts: 242
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Anywhere between 8.3 and 10.5 pulling a toad. For me it all depends on the wind. More wind, worse mileage. Interesting thing is best mileage (10.5) was in the mountains but no wind. Go figure!
WM
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Wimberleyman
2001 Cruisemaster/300 Cat
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06-23-2013, 10:41 PM
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#14
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Senior Member
Join Date: May 2009
Location: USA
Posts: 182
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A class A will never see 17 mpg. Something wrong with the calculations on that one.
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Roy & Sabine Lyons
98 Itasca 35' Class A Gas with Banks Powerpack
98 Honda CRV Toad
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