Mine is a 3500 Dodge with the DEF

Has 45k on it now and only one O2 changed under warranty

The mileage is not great 14 mpg around town, but then again it is a heavy truck 8900lbs unloaded.

on the high way it gets a little better mileage even with a loaded trailer

Tom ,

2011 Ram 3500 C&C Diesel
2009 Challenger R/T
1971 Challenger Conv. 511/4 speed
1970 Challenger R/T 503/727