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02-28-2016, 01:02 PM
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#1
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Nov 2009
Location: Olympia WA
Posts: 226
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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,
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2012 Journey 36m
Ed
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02-28-2016, 01:07 PM
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#2
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Senior Member
Entegra Owners Club
Join Date: Nov 2012
Posts: 8,149
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My DEF use runs about 2% of fuel use.
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Marc and Jill, Wellington FL
2013 Entegra Anthem 44SL
2018 Lincoln MKX
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02-28-2016, 05:51 PM
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#3
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Senior Member
Join Date: Apr 2012
Posts: 573
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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
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03-09-2016, 12:08 PM
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#4
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Junior Member
Entegra Owners Club
Join Date: Jan 2014
Location: Northern Virginia
Posts: 11
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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.
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03-09-2016, 05:09 PM
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#5
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Senior Member
Freightliner Owners Club
Join Date: Jan 2012
Location: SE Michigan & Central Florida
Posts: 228
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Mine is about 2.8%. Freightliner and Cummins suggested that the 13 gallon tank should last about 5000 miles. I actually realize +/-4500 miles.
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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
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03-09-2016, 05:56 PM
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#6
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Member
Join Date: Jul 2015
Posts: 32
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What is DEF?
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03-09-2016, 06:01 PM
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#7
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Senior Member
Join Date: Dec 2010
Location: Oswego IL
Posts: 2,393
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Quote:
Originally Posted by grant3791
What is DEF?
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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
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03-09-2016, 08:25 PM
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#8
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Senior Member
Join Date: Mar 2015
Posts: 224
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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.
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2016 Newmar Dutch Star 3736
2015 Jeep Wrangler Unlimited toad
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03-09-2016, 10:00 PM
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#9
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Senior Member
Join Date: Oct 2014
Location: Alberta
Posts: 598
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Quote:
Originally Posted by jimcumminsw
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.
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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
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03-09-2016, 10:10 PM
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#10
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Quote:
Originally Posted by G Schulz
I think the proper term is Diesel Particulate Filter. Maybe a spell check issue.
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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, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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03-09-2016, 10:18 PM
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#11
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Senior Member
Join Date: Jan 2014
Location: Safety Harbor, FL
Posts: 2,528
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Quote:
Originally Posted by G Schulz
I think the proper term is Diesel Particulate Filter. Maybe a spell check issue.
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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.
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2022 Thor Palazzo 33.5
2016 Jeep Wrangler Unlimited Rubicon Toad - Readybrute Elite Towbar
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03-09-2016, 11:53 PM
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#12
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Senior Member
Join Date: Oct 2014
Location: Alberta
Posts: 598
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Quote:
Originally Posted by jharrell
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.
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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
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03-10-2016, 08:23 AM
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#13
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Senior Member
Join Date: Jan 2014
Location: Safety Harbor, FL
Posts: 2,528
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Quote:
Originally Posted by G Schulz
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.
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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:
__________________
2022 Thor Palazzo 33.5
2016 Jeep Wrangler Unlimited Rubicon Toad - Readybrute Elite Towbar
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03-10-2016, 07:09 PM
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#14
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Senior Member
Join Date: Nov 2011
Location: Polk City Florida
Posts: 1,930
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To reply to the original question, 0ur 2014 Phaeton avg about 425 miles per gallon of DEF
__________________
Don and Nancy
[2018 Tiffin Bus 40 AP, 2022 Ford Edge ST , 9yr old sisters Sara n Kaycee, Havanese, Electric Catrike
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