DEF Mileage
4-25-2015. For anyone who is interested - I just posted an update on page 3 with my latest mpg after just refilling the DEF tank yesterday. +++++++++++++++++++++++++++++++++++++++++++++++++++++++++...
Forum Discussion
In heavy duty trucks DEF injection is in response to exhaust gas temp (higher NOX emission) - average is about 3%-4% x fuel volume when hauling at 140,000lbs GCW. 3gals to 4gals DEF per 100gals fuel.
