Cummins diesel engines have been available on Dodge Ram models since 1989. These engines generally offer greater towing capacity and better fuel economy than gasoline models.
As of 2010, Dodge offers the 6.7-liter Cummins turbo diesel engine as an option on the Dodge Ram 2500. The engine is standard on the 3500 series Ram.
The Environmental Protection Agency does not offer a fuel economy estimate for the Dodge Ram equipped with the diesel engine.
Motor Trend magazine lists an average of 15.7 miles per gallon on the highway for the Dodge Ram 2500.
Owners participating in online forums report average city/highway fuel economy in the 14 to 16 miles per gallon range.
Diesel engines produce significant amounts of nitrogen oxides and particulate matter, but the 6.7-liter Cummins turbo diesel engine meets EPA emissions standards.
