RV Trip Planning Discussions

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 02-28-2016, 01:02 PM   #1
Senior Member
 
Winnebago Owners Club
Freightliner Owners Club
Join Date: Nov 2009
Location: Olympia WA
Posts: 190
DEF consumption or MPG of DEF?

I've been averaging about 270 miles per gallon of DEF.
This is about 3.2%

Diesel fuel is averaging 8.4 miles per gallon.

Just wondering if others are tracking there DEF consumption and what there is?
I've got a 2012 Winnebago 36M ISB engine pulling a jeep wrangler unlimited.
Thanks,
__________________
2012 Journey 36m
Ed
erstanfo 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 02-28-2016, 01:07 PM   #2
Senior Member
 
MRUSA14's Avatar
 
Entegra Owners Club
Join Date: Nov 2012
Posts: 6,912
My DEF use runs about 2% of fuel use.
__________________
Marc and Jill, Wellington FL
2013 Entegra Anthem 44SL
2018 Lincoln MKX
MRUSA14 is offline   Reply With Quote
Old 02-28-2016, 05:51 PM   #3
Senior Member
 
asuperheat's Avatar
 
Join Date: Apr 2012
Posts: 540
With fresh DEF usage is 2%. as DEF ages that % goes up.
__________________
2015 Winnebago Tour 42QD
Cummins 8.9 ISL 450
Freightliner XCL W/IFS
asuperheat is offline   Reply With Quote
Old 03-09-2016, 12:08 PM   #4
Junior Member
 
Plumnitzer's Avatar
 
Entegra Owners Club
Join Date: Jan 2014
Location: Northern Virginia
Posts: 11
DEF

I have not done the measurements, but i was told by a service tech, DEF usage is also temperature dependent. For example, you will use more DEF in the fall and winter than you will in the summer.
Plumnitzer is offline   Reply With Quote
Old 03-09-2016, 05:09 PM   #5
Senior Member
 
mvpmich's Avatar
 
Freightliner Owners Club
Join Date: Jan 2012
Location: SE Michigan & Central Florida
Posts: 228
Mine is about 2.8%. Freightliner and Cummins suggested that the 13 gallon tank should last about 5000 miles. I actually realize +/-4500 miles.
__________________
mvpmich
2012 Sportscoach Cross Country 385 DS Freightliner XCR w/ Cummins ISB 6.7L 340 hp
2009 Saturn Vue, Blue Ox Alpha, RVi Brake 2
mvpmich is offline   Reply With Quote
Old 03-09-2016, 05:56 PM   #6
Member
 
Join Date: Jul 2015
Posts: 32
What is DEF?
grant3791 is offline   Reply With Quote
Old 03-09-2016, 06:01 PM   #7
Senior Member
 
jimcumminsw's Avatar
 
Join Date: Dec 2010
Location: Oswego IL
Posts: 1,877
Quote:
Originally Posted by grant3791 View Post
What is DEF?
Diesel Exhaust Fluid: Use in the latest Tier IV Bin 5 emission standards. This fluid is injected into the exhaust system to help clean the Diesel Practical Filter. Also known as UREA.
__________________
Jim & Jill
Sold: 2010 318SAB Cougar:New: 2016 Cedar Creek 34RL. 2008 Dodge 6.7LCummins the original 6.7L engine, w/68RFE Auto
jimcumminsw is offline   Reply With Quote
Old 03-09-2016, 08:25 PM   #8
Senior Member
 
Join Date: Mar 2015
Posts: 199
I've been adding a 2 1/2 gallon bottle every 2-3 fill ups (average ~60 gallons)

I know this isn't real precise, but the use of DEF is DEFininately less than I expected.
__________________
2018 Dynamax Isata 5 (on order)
2016 Roadtrek CS Adventurous (sold)
2015 Jeep Wrangler Unlimited toad
Slolane is offline   Reply With Quote
Old 03-09-2016, 10:00 PM   #9
Senior Member
 
G Schulz's Avatar
 
Join Date: Oct 2014
Location: Alberta
Posts: 545
Quote:
Originally Posted by jimcumminsw View Post
Diesel Exhaust Fluid: Use in the latest Tier IV Bin 5 emission standards. This fluid is injected into the exhaust system to help clean the Diesel Practical Filter. Also known as UREA.

I think the proper term is Diesel Particulate Filter. Maybe a spell check issue.


2009 Safari Cheetah 40'
350 HP Cat
2014 Ford Focus
Air Force One
G Schulz is offline   Reply With Quote
Old 03-09-2016, 10:10 PM   #10
Senior Member
 
Mr_D's Avatar
 
Country Coach Owners Club
Winnebago Owners Club
Solo Rvers Club
iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 36,995
Quote:
Originally Posted by G Schulz View Post
I think the proper term is Diesel Particulate Filter. Maybe a spell check issue.
And a new DPF is about $3,300 plus labor on our rig. Wish we had the DEF injection that the newer ones have. I think it would be more reliable than just the DPF.
__________________
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 Jeep JKU Dragon Edition
Mr_D is offline   Reply With Quote
Old 03-09-2016, 10:18 PM   #11
Senior Member
 
jharrell's Avatar
 
Join Date: Jan 2014
Location: Safety Harbor, FL
Posts: 1,583
Quote:
Originally Posted by G Schulz View Post
I think the proper term is Diesel Particulate Filter. Maybe a spell check issue.
Not only that but DEF does not clean the DPF, they serve two different purposes for two different pollutants.

DPF's trap soot and clean themselves through regeneration using more fuel to burn up the soot.

DEF turns NOx back into harmless Nitrogen and Oxygen.
__________________
Eagle 5 - 2016 Winnebago Vista 31be - CHF - Blue Ox Rear Track Bar - Centramatics
320w solar - TriStar MPPT 60 - Magnum 3012 inverter
2016 Jeep Wrangler Unlimited Rubicon Toad - Readybrute Elite Towbar
jharrell is offline   Reply With Quote
Old 03-09-2016, 11:53 PM   #12
Senior Member
 
G Schulz's Avatar
 
Join Date: Oct 2014
Location: Alberta
Posts: 545
Quote:
Originally Posted by jharrell View Post
Not only that but DEF does not clean the DPF, they serve two different purposes for two different pollutants.

DPF's trap soot and clean themselves through regeneration using more fuel to burn up the soot.

DEF turns NOx back into harmless Nitrogen and Oxygen.

My engine has a DPF and does use diesel to regenerate it's self. Didn't think DEF used the same system but wasn't sure.


2009 Safari Cheetah 40'
350 HP Cat
2014 Ford Focus
Air Force One
G Schulz is offline   Reply With Quote
Old 03-10-2016, 08:23 AM   #13
Senior Member
 
jharrell's Avatar
 
Join Date: Jan 2014
Location: Safety Harbor, FL
Posts: 1,583
Quote:
Originally Posted by G Schulz View Post
My engine has a DPF and does use diesel to regenerate it's self. Didn't think DEF used the same system but wasn't sure.
They do different things, DPF is for soot, DEF is for NOx.

They have a relationship in that for an engine to have met NOx emissions up to 2010 without DEF it needed more EGR to run cooler, because heat and pressure is what creates NOx from air. However when the engine runs cooler it creates more soot causing the DPF to need more often regeneration. So DEF helps reduce regeneration indirectly only because the EGR can now be reduced increasing temps, which also helps mileage and power. It doesn't necessarily change how regeneration is done, only how often it's needed.

For 2010 emission engine makers realized they couldn't meet the tougher standards without DEF, they tried everything, Navistar really tried and failed. EPA doesn't care how you get emissions down, just so happens DEF is the only viable way to get NOx down right now. Volkswagen got caught tweaking EGR which reduced power and mileage but only while testing instead of going with DEF, then on the road it ran hotter but no DEF, so it put out 40 times the NOx.

Here is a diagram, notice how the DEF system is after the DPF:


Name:   selective-catalytic-reduction-system-diagram.jpg
Views: 1036
Size:  21.6 KB
__________________
Eagle 5 - 2016 Winnebago Vista 31be - CHF - Blue Ox Rear Track Bar - Centramatics
320w solar - TriStar MPPT 60 - Magnum 3012 inverter
2016 Jeep Wrangler Unlimited Rubicon Toad - Readybrute Elite Towbar
jharrell is offline   Reply With Quote
Old 03-10-2016, 07:09 PM   #14
Senior Member
 
djbmsu's Avatar
 
Join Date: Nov 2011
Location: Polk City Florida
Posts: 1,854
To reply to the original question, 0ur 2014 Phaeton avg about 425 miles per gallon of DEF
__________________
Don and Nancy
[2017 Tiffin Bus 40 AP, 2018 Jeep Unlimited Sahara JL 6yr old sisters Sara n Kaycee, Havanese, Two Electric Bikes
djbmsu 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
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
How is the MPG (Fuel consumption) with your 36LA ?? peprous Tiffin Owner's Forum 12 11-16-2014 09:21 AM
DEF Consumption Rate gMw Cummins Engines 19 06-12-2013 02:16 PM


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


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