Although Mercedes certainly does not have the cleanest luxury vehicles on the road, the company has announced a set of improvements for its spring line-up of cars and claims that, in some cases, the new models burn up to 10 percent less fuel while pumping out more power.

Not every model has increased mpg numbers. In the case of the V6 SL 350, the engine output increased to 316 HP (up by 16 percent) but fuel consumption is 1.1 mpg lower, down to 28.5 mpg (Imperial, about 24 mpg U.S.). For the 8-cylinder SL 500 and the 12-cylinder SL 600, Mercedes has announced the same improvement.

For the SLK 350, the V6 increased the HP figures up to 305, while delivering 30.7 mpg (25 mpg U.S.), which is down 2.7 mpg. There's a SLK 200 Kompressor delivering the best mileage, 36.7 mpg (30.5 mpg U.S.) of the range. Then there's a larger SLK 280 good for 31.4 mpg (26 mpg U.S.) and the outrageous S55 AMG.

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