The fuel economy of the Dodge-Mopar 5.7 liter Hemi automobile engine varies significantly with the model and year of the vehicle, fuel used, city or highway road use and general driving habits. The comprehensive range across all vehicles is from 14 to 25 miles per gallon.
The 5.7 Liter Hemi engine is used in select Dodge Ram pickup trucks and Dodge Challenger and Charger cars. For this type of engine, the Challenger featuring a G2.1-type 5.7 liter engine had the best gas mileage, at an EPA-rated 17 miles per gallon on city streets and 25 miles per gallon for highway driving. This engine offers 379 horsepower and a torque of 410 pound-feet.