DEF usage ?

Discussion in '6.7 Common Rail' started by blacklabbob, May 20, 2014.

  1. jadocs

    jadocs Senior Member

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    No idea, I added 1 jug of DEF and it brought the level up 1/4.
     
  2. BennyHanna

    BennyHanna Member

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    I have been tracking my DEF usage pretty regularly. When I drive around town, or pull my camper I use much more. When I cruise down the highway, it seems to do much better. Which should be pretty obvious. Our trucks are designed to run on 3% DEF.

    Lets look at some real world numbers though.

    At 12,739 miles I had to fill my DEF again. I put in almost 2 full jugs (5 gallons). I'll call it 5 gallons as it was close enough. That puts me as adding 12.5 gallons total since I bought the truck new. Or about 1019 mpg of DEF. We should be burning about 3% DEF and 97% Diesel. So doing the math on it I should have burned only 416.67 gallons of diesel which would yield ~30.5 mpg of diesel. I wish I was getting that.

    According to Fuel Log Pro over the course of 12503 miles (didn't start tracking until after my first fill-up), I have averaged 16.7 mpg. Extrapolating that out for the full life of my truck I have used 762.81 gallons of fuel total. This means that my truck has only been burning about 1.64% DEF which is half of what it is designed to use.

    So why so little? My guess is that 90% or more of my miles are spent on the highway with cruise control set. I make a conscious effort to try and get the best economy as possible (I've made 200 mile trips where the display read 29mpg).
     
  3. ceide4489

    ceide4489 Member

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    I have 3100km on my 2014 and the DEF gauge has not moved off of full yet

    My dealer says should get 10-15000 km
     
  4. Synister

    Synister Junior Member

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    When I picked up my 2013 it had about 3/4 of a tank. The dealer did not fill it up but they did give me 2.5 gallons worth that they brought out from the service department so I was happy. Anyway truck now has 7500 miles, I waited until the tank was at 1/4 before I added the 2.5 gallons, that brought it up to 3/4 of a tank. Now it is back at 1/4 tank. So long story short I have approximately used up 5 gallons in 7500 miles.
     
  5. ceide4489

    ceide4489 Member

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    I am up to 6000km (3800 mile roughly) and about 1/3 of tank so far but have never added any. All was no pulling excpet for 125 miles where pulled 5000lb trailer
     
  6. younggeezer

    younggeezer Junior Member

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    It's good to know, I've got about 1100 miles on mine and the gauge hasn't moved yet.
     
  7. ceide4489

    ceide4489 Member

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    I am up to 7700Km and just under half a tank not so I would say 12000km or so out of tank

    I will add small jug and see how much it comes up
     
  8. Kenny kustom

    Kenny kustom Member

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    When I bought mine, it was right on empty ( along with the fuel tank)
    I moaned a little, and they gave me one jug. It brought it right up to full.

    I have just over 4km on it, and the gauge is just over half.

    So I bought another jug.
    It took ALMOST the whole jug.

    I think the gauge is a bit off. Lol
     
  9. jayhuc

    jayhuc Member

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    Also guys, look at the UREA%....
    UREA is the important part. DEF mostly water. I have seen some DEF from gas stations with under 20% UREA.
    I work at a MACK truck dealer. Mack warranty is void if anything under 30% urea is used. This is checked by a refractometer.

    Also to save money, Companys will buy 100% urea drum. And dilute themselfs.

    The picuture attached shows the UREA % in bottom right.
     

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  10. ceide4489

    ceide4489 Member

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    If not 32.5 it wont work but I dont think you can find any other percentage and if under 32.5 the truck will throw codes. I have looked everywhere and cant find any with out that concentration anywhere

    I would be very surprised to see any under 30 or for that matter anything other than 32.5
     

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