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Mercedes-Benz has launched the E 200 NGT BlueEfficiency, a bi-fuel natural gas/gasoline model that sports a four-cylinder, 163-horsepower supercharged "Kompressor" engine. The mill has been modified with an additional bank of fuel injectors, allowing it to run on either natural gas or gasoline.

Mercedes-Benz GLK BlueEfficiency - click above for high res image gallery

Mercedes 190 D BlueEFFICIENCY experimental vehicle (center) - Click above for high-res image gallery

Europe's Mercedes-Benz S 320 CDI BlueEfficiency began this year as the most frugal S-Class available. With 235 horsepower and 398 pound-feet of torque, 31 mpg, and S-Class luxury, it's a fine runner if you want to have it all without grenading your treehugging credentials. But hang on – new reports are now popping up suggesting that Mercedes will soon up the frugal luxury stakes with a new S 250 CDI BlueEfficiency – the first S-Class with a four-cylinder engine.

Click above for a hi-res gallery of the new Mercedes-Benz E-Class Coupe

click above for the C 350 CGI BlueEFFICIENCY in high-res

click for the C 250 CDI BlueEFFICIENCY Prime in high-res

Mercedes -- like a lot of other folks -- believes oil is going to run out eventually. But instead of waiting until the "Low on Oil" light comes on, the brand behind the three-pointed-star has set a goal to convert its entire fleet to run on alternative fuels by 2015. That's seven years to get off the drink we've all been addicted to for well over a century.

As announced for the A and B-series, Mercedes is naming its environmental line Blue Efficiency. MB's compact sedans, the C-Series, will now get the Blue Efficiency treatment. They will be offered with two engine versions, the C180 Kompressor (gasoline) and the C200 CDI (diesel). Both versions are about €500 cheaper than the previous base versions, at €30,613 and €32,516 respectively (in Germany).

BlueEfficiency, a very wide selection of green automotive technologies introduced by Mercedes at the Geneva Motor Show, will be available as an option for every single Mercedes Benz automobile. Dr. Thomas Weber, head of supervisory board at Daimler, tells CNBC "we will roll out this technology package from the A class, across the C class, up to the S class (that's as high the classes go). This package will be available for our customers in all model series of Mercedes." The best part the BlueEff

When Mercedes officially announced the BlueEFFICIENCY line of C-Class luxury sedans the other day, the company only showed us one picture: this one. Soon after, we got a small handful of other images, all of them highlighting the BlueEFFICIENCY traits of better engines, improved aerodynamics and other fuel-saving measures. You can peep these shots in the gallery below, keeping in mind that Europeans will be able to purchase the most economical of the BlueEFFICIENCY C-Class models - the 46-mpg C

Mercedes' C-Class luxury compact class just got a little greener. Well, since this is Daimler we're talking about, the correct term is bluer. Mercedes announced today the introduction of BlueEFFICIENCY, a combination of better engines, improved aerodynamics (.25 Cd!), lighter weights and smoother tires that reduce fuel consumption by up to 12 percent, to the C-Class.