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.