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 01-06-2016, 10:04 PM   #1
Junior Member
 
Join Date: Jan 2016
Posts: 2
Horsepower vs mileage

We are newbies to the forum and look forward to hearing your opinions. We owned a 2002 Monaco Diplomat 40PDQ with a 330 hp Cummins. We pulled a Jeep Liberty as our toad. Our only issue wasn't so much the fuel mileage but the lack of power pulling in the mountains. We sold the coach several years ago because we didn't have the time to really enjoy all the things the rv lifestyle has to offer. We have since retired and want to buy another coach. The question is we are looking at several 40 ft coaches that have over 500 hp engines. We love the idea of the extra hp and torque but how much will our fuel mileage suffer ? Any thoughts on the pros and cons would be appreciated.
__________________

__________________
Bobbyt 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 01-06-2016, 10:26 PM   #2
Senior Member
 
jondrew's Avatar
 
Join Date: Jan 2014
Location: Orlando
Posts: 1,841
My 300 HP Cummins pulled my Excursion and Nissan Murano thru the Tennessee mountains fairly well last year. Our new coach has a 380 HP Cummins. Haven't towed with it yet, but I'm pretty confident it's going to do just fine with our 40' Discovery. Unless you're sure you'll be pulling heavy loads through the mountains all the time, I'm not sure you need a 500 HP. You're certainly going to pay extra for it.

As far as mileage goes, does it really make a difference if you get 7 MPG or 10? Seems to me even when diesel goes back up (and count on that happening) a 30% hit in mileage would be the least of my concerns.

Good luck in your search
__________________

__________________
2015 Fleetwood Discovery 40G
2014 CRV w/EZ Tow
jondrew is offline   Reply With Quote
Old 01-06-2016, 10:42 PM   #3
Senior Member
 
FIRE UP's Avatar


 
Join Date: Dec 2009
Location: Out there, somewhere
Posts: 5,262
Quote:
Originally Posted by Bobbyt View Post
We are newbies to the forum and look forward to hearing your opinions. We owned a 2002 Monaco Diplomat 40PDQ with a 330 hp Cummins. We pulled a Jeep Liberty as our toad. Our only issue wasn't so much the fuel mileage but the lack of power pulling in the mountains. We sold the coach several years ago because we didn't have the time to really enjoy all the things the rv lifestyle has to offer. We have since retired and want to buy another coach. The question is we are looking at several 40 ft coaches that have over 500 hp engines. We love the idea of the extra hp and torque but how much will our fuel mileage suffer ? Any thoughts on the pros and cons would be appreciated.
Well,
The first thing you need to do is, STOP worrying about fuel mileage. As you already know, you're going to be driving a KLEENEX box. There's no aerodynamics in a rolling gymnasium. And, while having a larger, 500HP engine is great, the additional weight of a larger coach, that comes with that 500HP power plant consumes much of that additional HP.

Yes, you'll notice the difference from your older coach, no doubt about that. But, there are no rocket ship motor homes out there. Some are better than others. But face the fact that, even the largest engine ones slow some on hills and grades. Oh, they might make it up the hill faster than you're used to but, you'll still see some slowing down.

Our coach, an '04 Itasca Horizon 36GD with the C-7 330HP CAT, runs down the road nicely even with 6700 lbs. worth of toad and motorcycle attached. It does slow down on quite a bit on some of the steeper grades. It is what it is. I ALWAYS get to the top.

We hover between 6.5 mpg and 8. It's ultra rare for us to get into the 8s but, it does happen every now and then. Lousy fuel mileage is part of RVing. You don't buy one to get good mileage. Ain't happening. Oh, you'll read claims of upwards of 10 by some on here with large Diesel rigs but, I'm kind of a realist. When your pushing that kind weight, and up some of Americas super grades, mileage is non-existent.

The point is, you've lived long enough to get to retirement. You want to enjoy what America has to offer in terms of places to go and see, people to meet, fun things to do, and more, then write off the mileage.
Scott
__________________
2004 ITASCA HORIZON 36GD, 2011 GMC Sierra 1500 4x4 Toad '08 GL 1800 Gold Wing
Retired-29.5 yrs, SDFD, Ham - KI6OND
Me, Karla and the Sophie character, (mini Schnauzer)
FIRE UP is offline   Reply With Quote
Old 01-06-2016, 10:51 PM   #4
Senior Member
 
Mr_D's Avatar
 
Solo Rvers Club
iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 28,416
I use 7.5 for figuring. Our DSDP with 350 ISC (then added a Banks for 435/1200) would do between 7.5 and 8 overall over 48,000 miles.
With the present rig the VMS shows an overall of 7.6 for 45,000 miles. As to slowing down on the hills, I haven't noticed it at all. Go up the Grapevine on cruise control at 55 with no drop in speed and I can easily recover if I get slowed down by traffic. However, there aren't many 650 hp rigs out there either. Our empty weight is 46,000#'s so I figure 7.6 is good enough, especially since I still get that mileage loaded and towing a Honda Odyssey.
At 60 mph I'm showing 1350 on the VMS and tach. Rear gearing is 4.3 with the 315/80 drive tires. The calculated "sweet spot" for mileage is 1375 according to Cummins.
I wasn't worried about the fuel mileage, if I was I'd be driving a Prius and staying in motels.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft
Charter Good Sam Lifetime Member, FMCA, SKP
RV'ing since 1957, NRA Benefactor Life, towing '14 CR-V
Mr_D is offline   Reply With Quote
Old 01-06-2016, 10:55 PM   #5
Senior Member
 
Smitty77's Avatar
 
Join Date: Aug 2010
Location: Over the next hill, around the next curve...
Posts: 3,303
Sounds like you're looking at a bit higher up the food chain coaches this time around, as usually 500+ HP coaches are in the upper side. As mentioned, these usually are a bit heavier too, based upon content, possibly tag, beefier suspensions, if all electric they can have more batteries, etc.

That being said, quite often coaches with the larger block engines, more HP and more torque - do not work as hard moving down the road, or up the hill. They can yield the same, and sometimes better MPG then a small or midsize block, that could be working too hard to move the load of a coach thru the woods.

Gearing can also be different in the rigs with bigger engines, and that has an impact on MPG too.

Their are a few engines to avoid, so I recommend when you are looking for a coach, find out the specific engine that is producing that HP, and check up on that specific engine.

And you probably know the strong recommendation that is repeated quite often. Choose the coach that you like as far as interior design and livability - as that usually trumps everything else!

Best of luck on your search, happy hunting,
Smitty
__________________
Roo II is our 04 Country Coach Allure 40'
OnDRoad for The JRNY! Enjoy life...
Smitty77 is offline   Reply With Quote
Old 01-06-2016, 11:14 PM   #6
Senior Member
 
2 Stroker's Avatar
 
Join Date: Nov 2009
Location: Warren, Oregon
Posts: 1,719
Scott hit a home run again.
We have a 400 Cat and get 6.7 to 8.4 pulling a Honda Accord but we just got a Ford Edge 1500lbs more but I'm going to spend it before the kids get it, so if I get 6.2 great.
2 stroker
__________________
2006 Country Coach Inspire 360 40ft Genoa Designer Series, Samsung 197 RR
Cat C9--STEEL & COPPER Bolt Together Radiator w/ updated rubber mounting
SilverLeaf 330 Magnum 2812 PSW 2011 Ford Edge Sport-Air Force One
2 Stroker is offline   Reply With Quote
Old 01-07-2016, 08:11 AM   #7
Senior Member
 
Lincolnut's Avatar
 
Join Date: Mar 2013
Location: Artesia NM
Posts: 132
If you buy a Motorhome, Gas or Diesel, and worry about the fuel mileage then you probably should not buy a Motorhome...Just my opinion.....

I use a Pilot/Flying J card because of the .06 per gal. discount and every time I pull in to the pump I keep the receipt and when you look at the savings I have saved 1 to 2 bucks on a fill-up..........It is what it is and I just fire up that bad boy and tell my boys they need to make their money for retirement cause Mom & I are spending their inheritance......

Mike
__________________
2005 30 ft HR Admiral SE, F53 with V10
Peggy Sue the dog and the DW my Little Angel..
Having Fun with the T Bucket in that trailer behind my MH.......
Lincolnut is offline   Reply With Quote
Old 01-07-2016, 08:54 AM   #8
Senior Member
 
Papa_Jim's Avatar
 
Outdoors RV Owners Club
Join Date: Oct 2009
Location: Manitoba,Canada
Posts: 2,638
I don't think it matters much whether you have 300 HP or 600 HP. Depending on driving conditions, the speed driven, and the total weight being moved, your mileage is going to land somewhere between 6.5 and 8 mpg. Anything consistently lower or higher is uniquely exceptional in my opinion.

Jim
__________________
Jim & Kate
2016 Creekside 23RKS
2014 Ram 1500 4X4 Eco Diesel
Canada, eh?
Papa_Jim is offline   Reply With Quote
Old 01-07-2016, 10:58 AM   #9
Senior Member
 
Join Date: Jul 2012
Posts: 354
Quote:
Originally Posted by 2 Stroker View Post
Scott hit a home run again.
We have a 400 Cat and get 6.7 to 8.4 pulling a Honda Accord but we just got a Ford Edge 1500lbs more but I'm going to spend it before the kids get it, so if I get 6.2 great.
2 stroker

Hi Stroker. Can you tow the Edge 4 down? Do you have to do anything special to the Edge? How do you like it

Hurk
__________________
Hurk is offline   Reply With Quote
Old 01-07-2016, 11:13 AM   #10
Senior Member
 
Monaco Owners Club
Join Date: Dec 2010
Location: Kamloops, BC. Canada
Posts: 846
Let's see. 8MPG and boondock for the night........OR
drive a car ....30MPG and $150/night for food and motel.

Guess my MPG just went sky high.

Relax, and enjoy.
__________________
luckyd is offline   Reply With Quote
Old 01-07-2016, 12:14 PM   #11
Member
 
Join Date: Mar 2007
Posts: 74
MPG

Your MPG will be governed by you right foot.
__________________
st687, 97 Foretravel U270
08 Saturn Vue
University of Parris Island class of 66
st687 is offline   Reply With Quote
Old 01-07-2016, 12:20 PM   #12
Senior Member
 
Join Date: Jul 2014
Posts: 9,815
Quote:
Originally Posted by st687 View Post
Your MPG will be governed by you right foot.
Yup. It take so much HP to move a particular MH at a set speed.

Whether you have 100 or 500 HP, if it takes 90 HP, you will burn enough fuel for 90 HP.

If you need fast acceleration or more hill climbing power, down goes the mileage.
__________________
twinboat is online now   Reply With Quote
Old 01-07-2016, 12:29 PM   #13
Member
 
roadster27's Avatar
 
Vintage RV Owners Club
Fleetwood Owners Club
American Coach Owners Club
Spartan Chassis
Join Date: Nov 2014
Location: Jasper National Park , Alberta
Posts: 64
horsepower

Quote:
Originally Posted by Bobbyt View Post
We are newbies to the forum and look forward to hearing your opinions. We owned a 2002 Monaco Diplomat 40PDQ with a 330 hp Cummins. We pulled a Jeep Liberty as our toad. Our only issue wasn't so much the fuel mileage but the lack of power pulling in the mountains. We sold the coach several years ago because we didn't have the time to really enjoy all the things the rv lifestyle has to offer. We have since retired and want to buy another coach. The question is we are looking at several 40 ft coaches that have over 500 hp engines. We love the idea of the extra hp and torque but how much will our fuel mileage suffer ? Any thoughts on the pros and cons would be appreciated.
the bigger engines avg about 7.5 mpg , some less , and the 330 avg about 10 mpg
so consider about 1/3 more fuel
if you are planning lots of miles your wallet will hurt
but , you will get up the hills faster


Bev and Allen
99 AC TVS40
__________________
Bev & Allen 99 American Tradition 40TVS
8.3 Cummins 330 HP, Spartan Chassis
Pups: Maggie & Kona, Hotrod: 27T Roadster , Alberta
roadster27 is offline   Reply With Quote
Old 01-07-2016, 01:07 PM   #14
Senior Member
 
jondrew's Avatar
 
Join Date: Jan 2014
Location: Orlando
Posts: 1,841
Quote:
Originally Posted by st687 View Post
Your MPG will be governed by you right foot.
I notice a big difference between 65 MPH and 70Mph
__________________

__________________
2015 Fleetwood Discovery 40G
2014 CRV w/EZ Tow
jondrew is offline   Reply With Quote
Reply

Tags
power



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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Low Mileage cenfl Cummins Engines 11 12-08-2015 09:13 PM
Cummins horsepower narampa Class A Motorhome Discussions 25 08-22-2015 08:35 AM
Looking at a high mileage 2011 Mountain Aire miknkat Class A Motorhome Discussions 42 02-12-2015 12:12 PM
Actual Mileage for Western Trip seb1899 Class C Motorhome Discussions 6 10-19-2014 07:57 PM
5'th at 60 or 6'th at 70..best fuel mileage? MoonchaserTX Freightliner Motorhome Chassis Forum 7 06-28-2013 05:57 AM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 04:20 PM.


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