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 05-11-2014, 08:11 AM   #1
Senior Member
 
Musikboy's Avatar
 
Thor Owners Club
Nor'easters Club
Freightliner Owners Club
Join Date: Mar 2014
Location: MA
Posts: 140
Fuel Economy of your Motorhome

This was my maiden voyage in our new Thor Tuscany 40EX this past week. We drove 1000 miles back from Knoxville, TN over the course of 3 days. We were in no rush, we did not pull a toad, we had not used the Gen underway and we didn't restrict our use of dash air, we used it as we needed.

We started with a full tank and then topped off twice. Over the course of 1050 miles, we averaged 9.49 miles per gallon. I was thinking this was about average or even a little low. I had heard that we should get about 10-12 mpg with no toad.

We traveled at 62 mph most of the way, on cruise control a lot of the time. The Cummins ISB 360 hp engine performed well, we sailed up inclines without a strain or slowdown. We have an "exhaust brake" switch on the dash which I used frequently on the down slopes and found it to handle easily anything I encountered.

Over the entire trip we used about 1/4 tank if DEF. I am ordering more from Amazon so I carry a spare. Seems like a pain to fill up at a truck stop.

My question is; What is your mileage when you travel? Do you tow? Do you use your Gen underway? How fast do you go?

Here's the BIG question... What can we do to improve mileage? Do these fuel enhancers work? any other voodoo we can perform to boost economy? What about those $600 "chips" or programs, do they work or do they hurt the engine/transmission? Void warranty? Waste money?

All newbie questions, I realize but just wanted to get a benchmark and see what everyone else is doing.

Thanks!
Mitch
__________________

__________________
Carol & Mitch roaming around in a new 2013 Thor Tuscany 40EX
Musikboy 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 05-11-2014, 08:20 AM   #2
Senior Member
 
PDR John's Avatar
 
Join Date: May 2012
Posts: 3,627
We'll get anywhere from 5.9 as a low to 8.5 as a high, with over all average at 7.5.

I'm shoving a 44,000 lbs brick down the road at 62 mph, nothing is going to be efficient with that weight and aerodynamics.

I run the genny when it's hot and I want to run the roof ACs. I run the Oasis boiler when it's supper cold and I want more heat.
__________________

__________________
2013 DSDP 4347, all electric, 450 H.P. ISL
Air & hydraulic leveling
14 Jeep Grand Cherokee Overland toad
[SIGPIC][/SIGPIC]
PDR John is offline   Reply With Quote
Old 05-11-2014, 08:23 AM   #3
Member
 
Join Date: Dec 2013
Posts: 54
Sounds like your are on the right track. For me I went and bought two 5 gallon gas cans and went to a local station and filled them with DEF for $2.13 per gallon. Good luck on your travels
__________________
jlr44 is offline   Reply With Quote
Old 05-11-2014, 08:27 AM   #4
Senior Member
 
Musikboy's Avatar
 
Thor Owners Club
Nor'easters Club
Freightliner Owners Club
Join Date: Mar 2014
Location: MA
Posts: 140
Quote:
Originally Posted by jlr44 View Post
Sounds like your are on the right track. For me I went and bought two 5 gallon gas cans and went to a local station and filled them with DEF for $2.13 per gallon. Good luck on your travels
I have to look further, 3 stations so far that pump Diesel don't pump DEF. But that's a great suggestion!
__________________
Carol & Mitch roaming around in a new 2013 Thor Tuscany 40EX
Musikboy is offline   Reply With Quote
Old 05-11-2014, 08:28 AM   #5
Senior Member
 
hawgguy's Avatar
 
Join Date: Jun 2011
Location: West Texas
Posts: 2,682
I have the 350 engine with a same sized coach, no DEF but I do have the DPF and EGR. You are doing great. 10-12 mpg seems a bit optimistic. I tend to drive a little faster, with the genny on to run the roof airs and with a toad. (33-34,000 lbs at the scales). It seems that I usually have a headwind, weather going east-west or visa-versa (just my luck). I usually see 7-7.5 mpg, maybe more if my wife is driving. I have heard that the engines with DEF are a little more efficient.
__________________
hawgguy is offline   Reply With Quote
Old 05-11-2014, 08:44 AM   #6
Registered User
 
mel s's Avatar
 
Join Date: Mar 2010
Posts: 8,777
Quote:
Originally Posted by Musikboy View Post
This was my maiden voyage in our new Thor Tuscany 40EX this past week. We drove 1000 miles back from Knoxville, TN over the course of 3 days. We were in no rush, we did not pull a toad, we had not used the Gen underway and we didn't restrict our use of dash air, we used it as we needed.

We started with a full tank and then topped off twice. Over the course of 1050 miles, we averaged 9.49 miles per gallon. I was thinking this was about average or even a little low. I had heard that we should get about 10-12 mpg with no toad.
My question is; What is your mileage when you travel?
All newbie questions, I realize but just wanted to get a benchmark and see what everyone else is doing.
Thanks!
Mitch
Mitch
My coach has averaged 8.5 MPG over the last 105k miles, (towing or not).
That's $37,000+ worth of diesel...(BTW, at today's diesel prices that would be more than $50,000)!
If I could get 9.49 MPG I would be extremely happy.

Mel
35', '96 Safari, (3126 Cat), 132k miles
__________________
mel s is offline   Reply With Quote
Old 05-11-2014, 12:57 PM   #7
Senior Member
 
NorthernDriv's Avatar
 
Join Date: Mar 2014
Location: Mission,B.C.
Posts: 238
DP.......I believe that stands for the Mileage....Darn Poor...!
__________________
NorthernDriv is offline   Reply With Quote
Old 05-11-2014, 01:03 PM   #8
Senior Member
 
Green D's Avatar
 
American Coach Owners Club
Join Date: Mar 2008
Location: Van,Tx
Posts: 236
My first DP was a 275HP 36ft rig it avg 10.5 towing, so i dont think you will see those numbers.
My current MH avg 7.5 towing have seen 8+ on good days but avg 7.5 450HP 43ft

Just enjoy it!
Eric
__________________
2011 American Coach 42P Tradition
Pressure Pro
2013 Jeep Wrangler Unlimited
Green D is offline   Reply With Quote
Old 05-11-2014, 01:17 PM   #9
Senior Member
 
terry735001's Avatar
 
Join Date: Sep 2012
Posts: 1,158
Blog Entries: 11
i dont know to be happy or sad for me


when i installed the GM350 gas motor in my DP just to get the RV home i was getting on a flat roads 7.5 to 8 MPG and did this for 1200 miles with a rv 33-34,000 lbs as well
__________________
terry735001 is offline   Reply With Quote
Old 05-11-2014, 01:21 PM   #10
Senior Member
 
Skip426's Avatar


 
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 14,971
A whole bunch of questions and answers possible you'll get a ton of replies.
Maiden voyage, new coach , the big diesels don't achieve their best power and mileage till they're broken in, @ 25>30k miles.
The chips will void many warranties, engine/ transmission, and even if they do provide the mileage increases they claim could take many YEARS , depending on how much you drive, to provide a financial benefit.
Cat, used to have a pdf. file on their web page when they were still producing on highway engines. " Understanding Coach/RV Performance " should be required reading for every coach owner no matter what engine they have. I have it in print copy , and if I can locate a link I'll post it for you.
Top three ; in order; things that effect fuel mileage, Driver, Route & Speed.
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is offline   Reply With Quote
Old 05-11-2014, 01:45 PM   #11
Senior Member
 
Skip426's Avatar


 
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 14,971
Found it. Please take the time to read this.
Attached Files
File Type: pdf Cat_RV_Performance.pdf (246.3 KB, 227 views)
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is offline   Reply With Quote
Old 05-11-2014, 01:55 PM   #12
Community Moderator
 
Scarab0088's Avatar


 
Damon Owners Club
Workhorse Chassis Owner
Join Date: Mar 2012
Location: SoCal
Posts: 14,054
The #1 way to increase MPG is to reduce the speed. While 62 is admirable, going 55 might increase MPG by a measurable amount. Over time you may find your RV's drive-line set-up has a sweet spot for MPG on flat terrain...this varies rig to rig.

The #2 way to increase MPG is reduce weight. The OP was probably at the lightest weight that the RV will ever be, being new. So try to refrain from filling every bin with stuff you might not need. Even to fill the fresh water tank or not can impact the MPG.

The #3 way to increase MPG is speed control on inclines. Going uphill could be done at a lower speed to save fuel...then run down the backside. Most believe the cruise control is your friend, but that is not true when driving in hills or mountains.

Engine chips work, but might void a warrantee. Airflow devices might have some impact, but can be expensive.

Best luck and congrats on the new Coach
__________________
Kim and Steve, Mustang LCDR (Ret), Damon Outlaw #1193
I have seen gross intolerance shown in support of tolerance, Samuel Coleridge
https://www.irv2.com/attachments/signaturepics/sigpic84535_7.gif
WE LOVE OUR OUTLAW RV
Scarab0088 is offline   Reply With Quote
Old 05-11-2014, 03:30 PM   #13
Senior Member
 
Join Date: Nov 2013
Location: Florida
Posts: 294
I think the only problem is with whoever told you you would get 11-12 MPG in a 40' DP.
__________________
1998 Bounder 36s V10 F53
ohhwell is offline   Reply With Quote
Old 05-11-2014, 03:31 PM   #14
Senior Member
 
Join Date: Nov 2013
Location: Florida
Posts: 294
Quote:
Originally Posted by terry735001 View Post
i dont know to be happy or sad for me


when i installed the GM350 gas motor in my DP just to get the RV home i was getting on a flat roads 7.5 to 8 MPG and did this for 1200 miles with a rv 33-34,000 lbs as well
Now that is interesting beyond just the MPG. Do you have a write-up on that process anywhere?
__________________

__________________
1998 Bounder 36s V10 F53
ohhwell is offline   Reply With Quote
Reply

Tags
fuel, motorhome



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
Fuel pressure camping fam Cummins Engines 13 05-10-2014 09:49 PM
2005 Acert C13 low power and poor fuel economy slemnah Caterpillar Engine Forum 29 04-15-2014 05:26 PM
The Secrets of Better Fuel Economy dennis45 Class A Motorhome Discussions 13 03-25-2014 09:42 PM
Fuel Issues BigAWB Class A Motorhome Discussions 4 02-19-2014 04:58 PM
Anybody pulled the fuel rail and injectors on 8.1L? deputydog Workhorse and Chevrolet Chassis Motorhome Forum 14 01-15-2014 07:33 PM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 10:44 AM.


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