DEF usage?
Mountain Pass
Joined: Feb 2010
Posts: 186
Likes: 46
Sounds about right unfortunately. The 2020+ trucks seem to use DEF significantly faster than previous year 6.7's. My 11, 14, and 17 trucks never gave me DEF anxiety like this 20 does. Got in the habit of keeping 5 gallons with me in the 5th wheel just in case.
Senior User
Joined: Mar 2014
Posts: 443
Likes: 30
My 2020 usage is about 2.4%, so if I burn 100 gallons of fuel it uses 2.4 gallons of DEF. So if I am towing the fuel burn goes up and the DEF usage goes up.
my 2012 if I remember was about 1.5%, so my 2020 is definitely using more, my understanding is the new ones use more DEF and use less EGR, definitely a good trade off in my book.
my understanding is that the big over the road trucks use about 3% DEF, so the 2.4% certainly seems reasonable.
my 2012 if I remember was about 1.5%, so my 2020 is definitely using more, my understanding is the new ones use more DEF and use less EGR, definitely a good trade off in my book.
my understanding is that the big over the road trucks use about 3% DEF, so the 2.4% certainly seems reasonable.
Cross-Country
Joined: Sep 2003
Posts: 97
Likes: 16
From: Round Mountain, NV
I just finished a trip and used 6.27 gallons of DEF in 2,456.6 miles for 391.8 miles per gallon of DEF. 59% of that was towing my 33' toy hauler. That works out to 2.5% which matches pretty well with Rich53's experience above.
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Mountain Pass
Joined: Dec 2020
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From: Corrales, NM
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Tuned
Joined: Aug 2006
Posts: 405
Likes: 42
Due to this design, it doesn't look like DEF consumption will effect the DPF either way.
The SCR system however will be effected. Longer or shorter lifespan, its hard to say. Time will tell.
Lead Driver
Joined: Nov 2005
Posts: 8,466
Likes: 4,962
Depends...
The lower the fuel economy the more DEF the truck will use.
So far, my truck seems to be doing very well on DEF.
The lower the fuel economy the more DEF the truck will use.
So far, my truck seems to be doing very well on DEF.
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Mountain Pass
Joined: Dec 2020
Posts: 207
Likes: 39
From: Corrales, NM
I am towing a 42ft Solitude. UVW 13900...I averaged 12.5 mpg on this trip..avg 70 mph interstate all the way....which I will take...
FTE Leadership Emeritus
Joined: Sep 2000
Posts: 23,174
Likes: 1,678
From: Stephensville WI
No, the DPF and the SCR system are 2 different systems.
