Quote:
Originally Posted by Starmaster
...Most DEF systems are designed to operate at around 3% usage, i.e. will use about 3 gallons of DEF for each 100 gals of diesel. That's why you use more DEF when towing, you burn more fuel per mile...
|
DEF usage is based on MPG, so you'll use a bit more towing for that reason. There is a chart on the Walmart DEF container that shows amount of DEF used based on MPG. Using 9 MPG, miles from one gallon of DEF would be:
At 1% 900 miles.
At 2% 450 miles.
At 3% 300 miles.