In between debuting the Smart for-us and SL on the floor of the Detroit Auto Show today, Mercedes-Benzthought it right to bring out two brown cars that are actually green: diesel and gasoline flavors of the E-Classhybrid. In fact, the E300 diesel hybrid is so efficient that Mercedes calls it the "world's most economical luxury-class model." Unsurprisingly, the diesel will launch in Europe while the gas-powered E400 hybrid will arrive first in America and will later come to Japan, China and other countries. Pricing for the E-Class hybrids has not yet been announced, but Mercedes says the "extra cost involved here is only moderate."

As we learned during the slow-burning teaser month of December, the diesel-fueled BlueTec hybrid is expected to get 56 miles per gallon (on the European scale, so around 45 mpg in the U.S.) and the gas-electric E400 Hybrid will get 27 mpg (U.S.). The numbers for the E300 are based on the sedan (saloon) versions; it will also be available in estate (station wagon) form. The E-Class hybrids use a combination of lithium-ion batteries, start-stop, regenerative brakes and the ability to "sail" to save fuel. Sailing here means that, at speeds of up to 100 mph, the combustion engine can switch off while the electric motor keeps the car moving as long as the 0.8-kWh battery has enough power.

Since this is Mercedes, the cars also perform well: the E300 BlueTec offers 204 horsepower from the four-cylinder diesel powerplant and another 27 hp from the electric motor. The gas-powered E400 gives up 306 hp, plus the 27 hp. The E300 hybrid has a top speed of 150 miles per hour and goes 0-62 in in 7.5 seconds, while the E400 hybrid can hit 130 mph and does 0-60 in 6.7 seconds. Or, as Damiler's chairman of the board, Dieter Zetsche, put it this during the press conference in Detroit: Mercedes is "making green cars cooler and cool cars greener."

Blanco, S. (January, 10, 2012). Autoblog. Mercedes-Benz says E-Class hybrid makes cool cars greener. Retrieved from: http://www.autoblog.com/2012/01/10/mercedes-benz-e-class-hybrid-detroit-2012/