Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 06-23-2013, 06:48 PM   #1
Senior Member
 
bobioknight's Avatar


 
Join Date: Dec 2012
Posts: 255
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.
__________________

__________________
------------------------------------------
"Mrs. CC. Magna" 36' 1993 Country Coach, Magna, 300hp Cummins, 5 speed Alison trans. Acme Eze tow dolly with surge brake.
127,000 miles and counting...
bobioknight is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 06-23-2013, 07:06 PM   #2
Senior Member
 
dons2346's Avatar
 
Country Coach Owners Club
Join Date: Dec 2010
Posts: 4,488
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.
__________________

__________________
dons2346 is offline   Reply With Quote
Old 06-23-2013, 07:12 PM   #3
Senior Member
 
rvjimmy's Avatar
 
Newmar Owners Club
Freightliner Owners Club
Join Date: Mar 2011
Location: Almond, Wisconsin
Posts: 1,455
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
__________________
2002 Newmar Dutch Star DP3569 330 CAT - Toad Jeep Liberty, DW is the Nagivator. Work to travel and everything revolves around the price of diesel.
rvjimmy is offline   Reply With Quote
Old 06-23-2013, 07:13 PM   #4
Senior Member
 
vtwinwilly's Avatar
 
Join Date: Dec 2009
Location: North Texas
Posts: 600
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
__________________
vtwinwilly is offline   Reply With Quote
Old 06-23-2013, 07:17 PM   #5
srh
Senior Member
 
srh's Avatar
 
Monaco Owners Club
Join Date: Feb 2012
Posts: 1,117
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,
__________________
srh
2008 Signature
srh is offline   Reply With Quote
Old 06-23-2013, 07:52 PM   #6
Senior Member
 
docj's Avatar
Official iRV2 Sponsor
 
Join Date: May 2011
Posts: 3,716
Quote:
Originally Posted by srh View Post
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!
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
__________________
Joel Weiss--WiFiRanger RV Ambassador
RVParkReviews administrator
2000 40' Beaver Patriot Thunder Princeton CAT C-12
docj is offline   Reply With Quote
Old 06-23-2013, 09:16 PM   #7
srh
Senior Member
 
srh's Avatar
 
Monaco Owners Club
Join Date: Feb 2012
Posts: 1,117
Very Informative Article!

Quote:
Originally Posted by docj View Post
.

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
Thanks for providing this very informative article!

Regards,
__________________
srh
2008 Signature
srh is offline   Reply With Quote
Old 06-23-2013, 09:50 PM   #8
Senior Member
 
bobioknight's Avatar


 
Join Date: Dec 2012
Posts: 255
Quote:
Originally Posted by docj View Post
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
X2, yes thanks, most is over my head but very informative.
__________________
------------------------------------------
"Mrs. CC. Magna" 36' 1993 Country Coach, Magna, 300hp Cummins, 5 speed Alison trans. Acme Eze tow dolly with surge brake.
127,000 miles and counting...
bobioknight is offline   Reply With Quote
Old 06-23-2013, 10:00 PM   #9
Senior Member
 
hogdriver's Avatar


 
Entegra Owners Club
Join Date: Jan 2012
Location: Wintering-Orange Beach AL
Posts: 2,915
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.
__________________
Dave & Debbie
2014 Anthem 44B
2012 Jeep Rubicon toad
2016 Ford Edge toad
hogdriver is offline   Reply With Quote
Old 06-23-2013, 10:03 PM   #10
Moderator Emeritus
 
RickO's Avatar


 
Join Date: Jan 2007
Location: Litchfield Park, Arizona
Posts: 10,530
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
__________________
Rick, Nancy, Peanut & Lola our Westie Dogs & Bailey the Sheltie.

2007 Itasca Ellipse 40FD
RickO is offline   Reply With Quote
Old 06-23-2013, 10:07 PM   #11
Senior Member
 
Ramzfan's Avatar


 
Winnebago Owners Club
Freightliner Owners Club
Join Date: Dec 2010
Posts: 730
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.
__________________
06' Itasca Meridian 36g with CAT 350
2011 Jeep Wrangler 4-door
Ramzfan is offline   Reply With Quote
Old 06-23-2013, 10:37 PM   #12
Senior Member
 
LakeKerrGuy's Avatar
 
National RV Owners Club
Florida Cooters Club
Freightliner Owners Club
Join Date: Mar 2013
Location: Salt Springs, FL
Posts: 358
Quote:
Originally Posted by bobioknight View Post
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.
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.
__________________
Jack & Beverly
1999 National Tradewinds 7371; Cat 3126; 6 Speed Allison; 7.5 KW Onan; Freedom 20
2012 Nissan Versa on a EZE Tow
LakeKerrGuy is offline   Reply With Quote
Old 06-23-2013, 10:54 PM   #13
Senior Member
 
wimberleyman's Avatar
 
Join Date: May 2012
Posts: 224
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
__________________
Wimberleyman
2001 Cruisemaster/300 Cat
wimberleyman is offline   Reply With Quote
Old 06-23-2013, 11:41 PM   #14
Senior Member
 
rlyons's Avatar
 
Join Date: May 2009
Location: USA
Posts: 182
A class A will never see 17 mpg. Something wrong with the calculations on that one.
__________________

__________________
Roy & Sabine Lyons
98 Itasca 35' Class A Gas with Banks Powerpack
98 Honda CRV Toad
rlyons is offline   Reply With Quote
Reply

Tags
diesel



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 02:41 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.