BMW EfficientDynamics Edges, The Best

I think there is no need of review of BMW.As every one knows its quality.So,With the amazing EfficientDynamics supercar unveiled at the 2009 Frankfurt auto show, BMW promised a four-seat gullwing machine with the acceleration of an M3 and the fuel economy of a Mini diesel. At that point, the car's complex hybrid system had never been tested. Now, production is just two years away, in 2013.

Testing has proven engineers' original simulations, so the car will proceed with very few changes. Nestled behind the back seats is a tiny 161-horsepower combustion engine linked to a compact double-clutch gearbox to drive the rear wheels. That isn't enough to do the acceleration numbers BMW promised: 0-62 mph in 4.8 seconds.

he 2+2 weighs 3100 pounds, including batteries, enabled by widespread use of carbon fiber. Low mass is critical to squeezing good performance out of this powertrain, but so is low aerodynamic drag. Thanks to the concept's very low frontal area, the drag coefficient was just 0.22. Its "layered" construction has outer body panels mounted to the main body structure with a gap to channel air to critical parts such as the brakes, while creating little turbulence.