DEF Math
The owner's manual says my truck has a 5.5 gal DEF tank. I waited until I was down to 1/4 on the gauge, just above the red zone, and added a 2.5 gal box of Blue DEF from Advance Auto. Now the gauge ...
Forum Discussion
noteven wrote:
What we learned in the class 8 world is high EGT's (power demand) result in increased NOx emission which = increased DEF use. In a working class 8 truck that was around 1-2% DEF vs fuel.
If I owned a DEF using pickup I would measure in some DEF fills at the pumps vs fuel used and soon have a rate vs fuel use vs work we are doing today factor to know when to fill the DEF tank.
a shopping plaza or China parts store to buy DEF in a cardboard box down aisle 300.
In my case my DEF use is erratic because my truck is my daily driver. I'm not towing all the time.
Tying to calculate/predict my DEF use based on my driving habits is futile.
Just need a gauge!
