RV Trip Planning Discussions

Go Back   iRV2 Forums > THE OWNER'S CORNER FORUMS > Newmar Owner's Forum
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 03-24-2020, 06:18 PM   #1
Senior Member
 
96kpmjmm's Avatar
 
Join Date: Apr 2011
Posts: 272
DEF Consumption

In our 2016 Dutch Star with a 450 cummins whenever I filled up my DEF and divided gallons into miles and I would get about 260-280 miles per gallon. In our 2020 London Aire with a 605 cummins am getting 145 miles. I am little surprise with that. Fuel is pretty close but I have been cruising a little faster. This DEF consumption gap from the DS to LA seems really big to me.
__________________

__________________
Kevin
2020 London Aire 4543
2019 Dodge Ram 1500. Emerald Isle NC
96kpmjmm 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 03-24-2020, 07:37 PM   #2
Senior Member
 
NCC-1701A's Avatar


 
Join Date: May 2018
Posts: 455
From the Cummins Filtration DEF guide:

https://cumminsfiltration.com/sites/...es/MB10033.pdf


DEF Usage
Q. How much DEF will a truck consume? A. DEF consumption is expected to be approximately 2% of fuel consumption, depending on vehicle operation, duty cycle, geography, load ratings, etc.

Q. What is the number of miles a truck can expect to travel on one gallon of DEF? A. DEF consumption is directly related to fuel consumption. A truck averaging 6 MPG can expect to go approximately 300 miles on one gallon of DEF.
__________________

__________________
"Second star to the right and straight on 'til morning"
On the Mississippi in SE Minnesota
2013 Newmar Mountain Aire 4336
2016 Chevy Silverado 4x4
NCC-1701A is offline   Reply With Quote
Old 03-25-2020, 03:15 AM   #3
Senior Member
 
96kpmjmm's Avatar
 
Join Date: Apr 2011
Posts: 272
I have a Freightliner appointment this week and I will ask them about this. Thank you for responding
__________________
Kevin
2020 London Aire 4543
2019 Dodge Ram 1500. Emerald Isle NC
96kpmjmm is offline   Reply With Quote
Old 03-25-2020, 04:17 AM   #4
Senior Member
 
Join Date: May 2017
Posts: 1,858
Regardless of what they print Iíve owned Mh with the 450 and two Cornerstones, one with the Cummins 600 and a new one with the 605. Both of the big engines use twice as much DEF. Both the 600s get about the same fuel mileage and if you could use the 2% figure would use close to same DEF. However, Iíve talked to Cummins and their figures are 2-5% DEF usage and while the big engine gets approximately the same fuel economy they pump a lot more air hence the extra DEF usage. Thatís Cummins story and theyíre sticking to it.
__________________
J.H. 2020 45W Cornerstone
2020 Ram Limited eco diesel
Rollin101 is offline   Reply With Quote
Old 03-25-2020, 01:05 PM   #5
Senior Member
 
Rev. Roy's Avatar
 
Join Date: Mar 2017
Posts: 130
According to Angie from NIRVC, DEF use is approximately one gallon for every fifty gallons of diesel. We have found that to be pretty accurate. We've never tracked it by millage I just fill it every 3-4 times I refuel.
Rev. Roy is online now   Reply With Quote
Old 03-25-2020, 03:22 PM   #6
Senior Member
 
Join Date: May 2017
Posts: 1,858
Quote:
Originally Posted by Rev. Roy View Post
According to Angie from NIRVC, DEF use is approximately one gallon for every fifty gallons of diesel. We have found that to be pretty accurate. We've never tracked it by millage I just fill it every 3-4 times I refuel.
That certainly wonít hold true for the ISX or X15 engines.
__________________
J.H. 2020 45W Cornerstone
2020 Ram Limited eco diesel
Rollin101 is offline   Reply With Quote
Old 03-25-2020, 04:53 PM   #7
Senior Member
 
Tiffin Owners Club
Entegra Owners Club
Join Date: Jan 2016
Posts: 351
Quote:
Originally Posted by 96kpmjmm View Post
In our 2016 Dutch Star with a 450 cummins whenever I filled up my DEF and divided gallons into miles and I would get about 260-280 miles per gallon. In our 2020 London Aire with a 605 cummins am getting 145 miles. I am little surprise with that. Fuel is pretty close but I have been cruising a little faster. This DEF consumption gap from the DS to LA seems really big to me.
Quote:
Originally Posted by Rev. Roy View Post
According to Angie from NIRVC, DEF use is approximately one gallon for every fifty gallons of diesel. We have found that to be pretty accurate. We've never tracked it by millage I just fill it every 3-4 times I refuel.
Just did a ruff estimate for our 18 Anthem with the 450 "should compare well to your Dutch Star" - looks to be about 400 to 430 miles per gallon of DEF - 51 to 54 gallons of diesel. Normally cruise between 64 to 68.
__________________
2018 Entegra Anthem 44B
2016 Tiffin Allegro 36LA (Gone, but not forgotten)
mike625 is online now   Reply With Quote
Old 03-26-2020, 04:49 AM   #8
Senior Member
 
96kpmjmm's Avatar
 
Join Date: Apr 2011
Posts: 272
I am using 2.5- 3 gallons of DEF to 50 Gallons. I have a Freightliner appointment this weekend and will ask them. I just wanted to know if this was within normal usage. Thank you all for responding, safe travels and stay well.
__________________
Kevin
2020 London Aire 4543
2019 Dodge Ram 1500. Emerald Isle NC
96kpmjmm is offline   Reply With Quote
Old 03-26-2020, 07:43 AM   #9
Senior Member
 
Join Date: May 2017
Posts: 1,858
Quote:
Originally Posted by 96kpmjmm View Post
I am using 2.5- 3 gallons of DEF to 50 Gallons. I have a Freightliner appointment this weekend and will ask them. I just wanted to know if this was within normal usage. Thank you all for responding, safe travels and stay well.
The ISX that I had would use about a gallon every 175 miles. I’ve only got 1400 miles on this X15, but it appears to use about the same.
__________________
J.H. 2020 45W Cornerstone
2020 Ram Limited eco diesel
Rollin101 is offline   Reply With Quote
Old 03-28-2020, 11:29 AM   #10
Member
 
ScottyA's Avatar
 
Join Date: Mar 2011
Posts: 74
Mileage: 44,303.0
DEF - 273.28 gallons
Fuel - 7,123.41 gallons

6.22 MPG
162.12 MPG of DEF
26.07 gallons of fuel to 1 gallon of DEF
Average price for fuel - $2.34 per gallon
Average price for DEF - $3.52 per gallon
__________________
Scott Benson
2016 Newmar London Aire
2016 Cadillac SRX
ScottyA is offline   Reply With Quote
Old 03-28-2020, 07:58 PM   #11
Senior Member
 
Join Date: Nov 2017
Location: Naples, Florida
Posts: 168
The 2017 model year engines have significant increases to DEF consumption. It was part of the newer emission system logic. Also they lowered the use of EGR in those same engines. Itís a good trade off. But you can not compare pre 2017 to a newer engineís use. 5-7% is the new norms, just about double previous use.
__________________

__________________
New Aire 3343
Pelican Lake Motorcoach Resort
Newaire1 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
DEF consumption or MPG of DEF? erstanfo Class A Motorhome Discussions 16 03-13-2016 02:00 PM
2015 London Aire, DEF consumption Biverson Newmar Owner's Forum 12 08-09-2015 07:58 PM
DEF Consumption slabman Newmar Owner's Forum 12 11-24-2014 03:55 PM
DEF Consumption Rate gMw Cummins Engines 19 06-12-2013 02:16 PM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 12:13 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
×