The 2011 ActiveHybrid 7 is a mild hybrid and features a 0.4 kWh lithium-ion battery pack. The electric motor is combined with BMW’s 4.4-liter twin-turbo V8 and new 8-speed automatic transmission to accelerate from 0 – 60 mph in just 4.7 seconds. Estimated EPA fuel economy is 17 miles per US gallon (14 L/100 km; 20 mpg-imp) city and 26 miles per US gallon (9 L/100 km; 31 mpg-imp) for highway, which represents almost an 18% improvement over the non-hybrid 750i/Li.