2021 Dodge Durango SRT Hellcat AWD Rolling Thunder The 2021 Dodge Durango delivers both excitement and modernized refinement thanks to its world-class suspension. This Durango SRT is powered by a 6.2-liter supercharged HEMI SRT Hellcat V8 engine, pumping up to 710 horsepower and 645 lb-ft of torque through the TorqueFlite 8HP95 8-speed automatic transmission. 6.2L supercharged HEMI V8 under the hood. (Courtesy of Stellantis Media) Fuel consumption for this mad muscle powertrain is rated at 13 mpg city and 17 mpg highway, for a 15 mpg combined average. Outside, flanking the grille are LED bi-functional projector headlamps that combines LED auxiliary low beam light with amber turn signal. They are functionally complemented by Automatic High-Beam Headlamp control.