Quote:
Originally Posted by rohrmann
The use of DEF works with the catalyst to reduce NOX emmisions, and with that process, they can lean out the fuel which gives you better fuel mileage. The little bit of expense for the DEF is more than returned in better mileage. I also like not puking black smoke out the exhaust, which is just raw fuel being wasted.
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Yes you more than makeup for the cost of the DEF in fuel mileage and more power. Remember when the 08 trucks got 13 MPG and now they 20.
Lynwood