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As a point of comparison, the '09 Ram with the 5.7 is rated for 13/18.  PickupTrucks.com reviewed a Ram Runner and reported that their average mileage was 12-13 - the same as the Raptor.  Adding rotating weight and adding frontal area will kill mileage regardless of the vehicle.  I bet an eco-boost in the Raptor would improve the mileage, but hoping for 20 mpg @ 70mph is a pipe dream for this truck.