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 12-31-2013, 01:27 PM   #1
Junior Member
 
Join Date: Dec 2013
Posts: 24
What should I expect MPG with 45ft MH?

Can you tell me what I should expect the get in MPG for a 45ft MH fully loaded with 5,000 lb toad? I am looking at four different engines; 500hp, 525hp, 600hp, 650hp. What should I expect in rocky mountain terrain? What should I expect in flat terrain? What should I expect in hilly terrain? I will be in hilly to flat terrain most of time with occasional rocky mountains. If anyone could help me with my decision on engine and mpg I would greatly appreciate it. Thank you.
__________________

__________________
CC Rider 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 12-31-2013, 01:33 PM   #2
Senior Member
 
Join Date: Nov 2012
Location: New Mexico
Posts: 116
I would think 500 hp would be plenty w/ that toad. I pull a 32' race trailer weighing 9700# loaded with a 400 Cummins and it has no problem topping Raton pass @ 48 mph. Getting 6 to 6.5 mpg, that's all I can expect............... JB
__________________

__________________
pivotdoc is offline   Reply With Quote
Old 12-31-2013, 01:39 PM   #3
Junior Member
 
Join Date: Dec 2013
Posts: 24
JB,
thanks. do u average 6-6.5mpg? Is this mainly in flat terrain?
__________________
CC Rider is offline   Reply With Quote
Old 12-31-2013, 01:54 PM   #4
Senior Member
 
mmartin's Avatar
 
Join Date: Apr 2013
Location: Long Beach, Calif.
Posts: 189
The old saying is: better to have and not have to use it vs. not having it and needing it. The smaller engines will get better mpg on flat driving but will be cancelled out when you need to keep your foot in it to get up and over those hills. The manufacturers offer the larger engines to the larger coaches (42'-45') for a reason. You have a lot more capacity to fill and I am sure you have upgraded interior which also adds to the weight. Depending how much you are going to drive and how long you are going to keep the coach, checking the price difference between engines would definitely be a priority. Engine maintenance cost will be generally the same
__________________
mmartin is offline   Reply With Quote
Old 12-31-2013, 02:05 PM   #5
Senior Member
 
Steve Ownby's Avatar
 
Join Date: Nov 2008
Location: Cosby, Tn
Posts: 6,397
Quote:
Originally Posted by 1jrbrooks00 View Post
Can you tell me what I should expect the get in MPG for a 45ft MH fully loaded with 5,000 lb toad? I am looking at four different engines; 500hp, 525hp, 600hp, 650hp. What should I expect in rocky mountain terrain? What should I expect in flat terrain? What should I expect in hilly terrain? I will be in hilly to flat terrain most of time with occasional rocky mountains. If anyone could help me with my decision on engine and mpg I would greatly appreciate it. Thank you.
Realistically you are looking at a range of 5.5 to 7.5 depending on your driving style and conditions. The biggest factors are vehicle weight and speed. My 500 hp is capable of 8 + when driven conservatively and the Conditions are flat to rolling. My coach weighs 45k with toad.
__________________
Steve Ownby
Full time since 2007
2003 Monaco Signature
Steve Ownby is online now   Reply With Quote
Old 12-31-2013, 02:14 PM   #6
Junior Member
 
Join Date: Dec 2013
Posts: 24
Steve,
thanks. so if you had a 525 or 600 hp you would not get the 8 as you do with the 500hp?
__________________
CC Rider is offline   Reply With Quote
Old 12-31-2013, 02:23 PM   #7
Senior Member
 
HHIDan's Avatar
 
Join Date: Mar 2011
Location: Ottawa Ontario Canada
Posts: 1,254
From everything I read and from my own experience you will get between 5.5 and 7.5 as stated in previous post. The speed you drive will have more impact than 400 vs 600. And IMHO coach manufacturers offer a 600HP engine for guys with a bigger wallet and not because it's absolutely required...
__________________
DanielB
'06 Mountain Aire 4309, ISL 400-CM850, Spartan MMGT
'16 Jeep Wrangler
HHIDan is online now   Reply With Quote
Old 12-31-2013, 02:57 PM   #8
Junior Member
 
Join Date: Dec 2013
Posts: 12
weight of the motor home and larger engines will need more fuel. I use to drive and tractor and trailer with 60 to 75 thousand lbs. A 400 hp will do good in the hills just let let the engine do it job stop trying to fly up the mountains cause you will fly faster going down. Bigger engine take more fuel to operate. Take a pick more fuel nph or going fast.
__________________
leatherneck is offline   Reply With Quote
Old 12-31-2013, 04:23 PM   #9
Senior Member
 
nforus's Avatar


 
Join Date: May 2013
Posts: 786
We average 5.6 over all terrain, 600 hp ISX, coach weighs 50,250 loaded with water, gear, fuel, and occupants. I think the TOAD adds another around 4500#'s. We run between 65 and 72 MPH.
__________________
2013 Polaris RZR 4/900
Location: Colorado
nforus is offline   Reply With Quote
Old 12-31-2013, 05:30 PM   #10
Senior Member
 
Selah's Avatar
 
Join Date: Oct 2012
Location: Indiana
Posts: 2,320
Just out of curiosity, are you going to pick which $400K+ coach based on MPG
Or is there a manufacturer that offers the same coach with optional engine size?
__________________
Paul, Kathy, and Tux the Mini Schnauzer
2014 Tiffin Phaeton 42 LH, 2013 Honda CRV
"When the time comes to look back, make sure you'll like what you see"
Selah is offline   Reply With Quote
Old 12-31-2013, 05:36 PM   #11
Senior Member
 
jeryan59's Avatar
 
Fleetwood Owners Club
American Coach Owners Club
Spartan Chassis
Join Date: Apr 2012
Posts: 667
i average between 5.5 and 6.0 mpg, 2009 425 hp Cummins grossing about 58,000 lbs with trailer. I usually set cruise on about 64 mph.

I think year of motor will affect your mileage as well, newer motors have more emissions which I see as negatively affecting mpg.

My 1999 350 hp Cummins without tag axle I would average 7.0-7.5 mpg with same trailer and load. Yes the 2009 set up is heavier, but most of the additional loss in mpg is attributed to emissions in my opinion.

One thing I would look at while you are calculating, is approximately how many miles you will drive annually? If you are average RV, about 7,500 miles per year, at 5.5 mpg you will use about 1,364 gallons per year. If you average 6.75 mpg, you would use 1,111 gallons, so at $4.00 per gallon for diesel, that is about $1,000 difference per year in fuel costs, which in my opinion is very small amount of money considering the fun, size of your motorhome, and power you will have with any of your options.

If you averaged heavy use at 12,000 miles per year, 405 gallons more at 5.5 mpg versus 6.75 or $1,620 annually. From my experience these are not the most significant dollars in RVing in a Class A diesel which I have done part time over the past 13 years. I'm not minimizing your concerns on the mileage (assuming that is your concern?); just pointing out the real costs differences in my opinion aren't that significant to the overall costs associated with these options.

But generally speaking, as you increase HP your mileage will go down assuming we are looking at engines newer than 2008. Depending on the manufacturer of the engines, mine have both been Cummins, the Cummins website will give you an estimate on mpg for each motor.

Good luck in whatever you decide, I don't think you will make a bad decision one way or the other from your options you are inquiring about.
__________________
Johnny Rotten
2009 American Eagle 42'
Trailering HD Road Glide and Saab 9.3 or Cadillac Escalade ESV
jeryan59 is offline   Reply With Quote
Old 12-31-2013, 05:42 PM   #12
Senior Member
 
Arch Hoagland's Avatar
 
Monaco Owners Club
Workhorse Chassis Owner
Join Date: Aug 2002
Location: Clovis, CA, USA
Posts: 5,910
Quote:
Originally Posted by Selah View Post
Just out of curiosity, are you going to pick which $400K+ coach based on MPG
Or is there a manufacturer that offers the same coach with optional engine size?
I was wondering the exact same thing.
__________________
2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
Arch Hoagland is offline   Reply With Quote
Old 12-31-2013, 06:07 PM   #13
Senior Member
 
Triker56's Avatar
 
Fleetwood Owners Club
Join Date: Jun 2009
Posts: 3,950
I am wondering why anyone that has the money to buy a MH with that much HP.
Even cares what the MPG will be.

Maybe the OP can just plan on 5.5 MPG and then be happy if it gets more.
The real cost will be all that depreciation that will happen after buying it.
__________________
99 Discovery 34Q ISB
2014 MKS AWD EcoBoost Toad
Fulltime Since "99"
Triker56 is offline   Reply With Quote
Old 12-31-2013, 06:17 PM   #14
Senior Member
 
thrushl's Avatar


 
Appalachian Campers
Mid Atlantic Campers
Coastal Campers
Holiday Rambler Owners Club
iRV2 No Limits Club
Join Date: Jul 2012
Location: Orlando, Flordia
Posts: 305
Friends, let's not forget that a HUGE part of MPG in these engines is as some pointed out --- THE DRIVER.

My two cents, I have a 515 Detroit and I run the hills on both coasts faster than I should and the engine doesn't break a sweat. I'm at 56K with trailer. I normally get in the 7.5 range OVERALL.

My comment; all these engines will do great. Don't pay extra for a larger engine. Pick the coach you want and enjoy it.
__________________

__________________
Leo & Cindy Thrush (aka "RVM46") Cats: Latte, Jelly Bean
"There are many things given to us in this life we do not deserve. What we do with such things; that is the true mark of a man!"
2005 Holiday Rambler, 45' PGA 2007 Jeep Liberty in trailer
thrushl is offline   Reply With Quote
Reply



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
Any Monaco Vesta Owners Here? tjd Monaco Owner's Forum 2026 Yesterday 03:14 PM
Best MPG class A GAS mikebrls Class A Motorhome Discussions 111 02-15-2014 06:16 PM
Palazzo Owners gmadams Palazzo Motorhomes 2879 01-16-2014 03:54 PM
MPG kees boode Class A Motorhome Discussions 22 12-01-2013 05:09 PM
Diesel Break in before MPG improve bobfa Trailer Towing and Tow Vehicles Discussion 21 11-18-2013 09:50 PM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 08:35 AM.


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