888-283-6402 The available 6.7L Power Stroke V8 turbo diesel and the 6.2L V8 gas engine were engineered and built to deliver best-in-class fuel economy. The impressive thing is that the fuel economy is achieved with engines that are light in weight but big in towing, hauling, torque, horsepower and all-around toughness. The 6.7L Power Stroke turbo diesel delivers a 20 improvement over the previous diesel, while the 6.2L gas V8's improvement is 15.