6.7L DPF FLUID

[LT Snyder]

Those of you running the 6.7 L diesel, how much def fluid are you going through? I haven't figured out how many miles I'm getting per tank but it's not much compared to my 6.7L powerstroke.

 

[Gr8bawana]

I was pleasantly surprised at how little DEF I use when not towing.
I found this article very helpful.

Q. How can an operator determine how much DEF they will need/use? A. DEF consumption will be approximately 2% of the diesel fuel consumed. Another way to consider it is that DEF will be consumed on a 50 to 1 ratio with diesel. (For every 50 gallons of diesel fuel burned, you will use 1 gallon of DEF).

If you know the average fuel consumption of a vehicle, you can easily calculate the amount of DEF that will be used. Annual miles for average truck = 50,000 miles MPG for average truck = 8 mpg 50,000 miles / 8 mpg = 6,250 gallons diesel fuel per year DEF usage @ 2% of fuel consumption = 125 gallons of DEF / year 125 gallons / 10 gallon tank (average size) = 13 DEF fill-ups / year Example…Heavy duty Annual Miles per Vehicle Annual Total Miles Average MPG per Truck Average DEF Tank Size (on vehicle) Annual Fuel Usage (gallons)

Consumption per Gallon of fuel Estimated Annual DEF Consumption DEF FillUps per Year 120,000 120,000 6 20 20,000 2% 400 20 Annual miles for average truck = 120,000 miles MPG for average truck = 6 mpg 120,000 miles / 6 mpg = 20,000 gallons diesel fuel per year DEF usage @ 2% of fuel consumption = 400 gallons of DEF / year 400 gallons / 20 gallon tank (average size) = 20 DEF fill-ups / year

Example…Medium Duty Annual Miles per Vehicle Annual Total Miles Average MPG per Truck Average DEF Tank Size (on vehicle) Annual Fuel Usage (gallons) Consumption per Gallon of fuel Estimated Annual DEF Consumption DEF FillUps per Year 50,000 50,000 8 10 6,250 2% 125 13

 

[mtnrider]

I haven't calculated it but it goes a long way. Just FYI though, the gauge is not linear. It will sit on full forever before it moves and will move quicker the last ~1/3 of the tank (per the gauge).



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[LT Snyder]

Hmmm. I know my powerstroke would go 10,000 miles on a tank of def fluid. I know my new dodge has a ten gallon def tank and in 2,500 miles I've gone through 10 gallons of def. Sure seems like a lot

 

[chri5k]

Hmmm. I know my powerstroke would go 10,000 miles on a tank of def fluid. I know my new dodge has a ten gallon def tank and in 2,500 miles I've gone through 10 gallons of def. Sure seems like a lot

Under what conditions was DEF usage that high? Heavy towing? What model RAM? Also, did the capacity of the DEF tank double from 5 gallons in 2019 to 10 gallons in 2020?

 

[tjfdesmo]

Cab & Chassis have a bigger DEF tank. Pickups are not 10 gallons. The new 19+ Cummins use more DEF than previous. When pulling, I would estimate 500 mpg, overall average is approx 800 mpg.

For early build '19s there was a reflash for excessive DEF consumption.

 

[crash68]

I know my new dodge has a ten gallon def tank and in 2,500 miles I've gone through 10 gallons of def.

Also, did the capacity of the DEF tank double from 5 gallons in 2019 to 10 gallons in 2020?

The DEF tank capacity for the '19/'20 HD trucks is 5.7 gallons(21 liters).
Right from the owners manual:

 

[LT Snyder]

Thanks for the insight everyone.