The Mercedes-Benz E400 Hybrid is a plug-in hybrid version of the Mercedes-Benz E-Class. It was introduced in 2014 and is based on the current E-Class model. It combines a 3.0 litre V6 gasoline engine, an electric motor and a lithium-ion battery pack to deliver a total power output of 328 horsepower. The E400 Hybrid has a range of about 18 miles on electric power alone and up to 37 mpg in mixed city/highway driving. It features a 7-speed automatic transmission, 4MATIC all-wheel drive, and an ECO start/stop system to help conserve fuel.