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Under the hood is the new 6.7L inline-six Cummins turbodiesel. This engine is a powerhouse compared to the old 5.9, but unfortunately to meet current diesel emissions regulations, the mileage of the Cummins (and many of its competitors) has taken a hit. Fully loaded with two small Jeeps, the rollback resulted in mileage around 12 mpg during a road trip to and from Moab with this brand-new truck.