Discussion in '6.7 Common Rail' started by blacklabbob, May 20, 2014.
No idea, I added 1 jug of DEF and it brought the level up 1/4.
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).
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
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.
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
It's good to know, I've got about 1100 miles on mine and the gauge hasn't moved yet.
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
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
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.
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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