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So the RAM 1500 EcoDiesel differs from a regular RAM in more ways than fuel source.

The EcoDiesel gets a thermal management system which speed warms transmission oil to increase efficiency. There is parasitic loss associated with pumping cold, low viscosity oil.

Also included are active grill shutters that debuted on the 2013 RAM. They boost mileage by .5% and cuts drag by 4%.

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