COMING FROM BMW: The most powerful hybrid in history: “The BMW X6 ActiveHybrid has arrived, and as previously covered, the new gas-electric X6 will be the most powerful hybrid in history, with 480 peak horsepower and diesel-like plateau of 575 lb-ft of torque. That impressive powertrain consists of twin electric motors (delivering 91 hp and 86 hp, respectively) and a twin-turbo 4.4-liter V8 engine.” Of course, the problem with the “most powerful” hybrid is this: An estimated 18 mpg combined. Not all that impressive for a hybrid.