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That figure and its 331 lb-ft of torque makes the 2.0-litre turbo the most powerful production four-cylinder in the world, but it still promises 40 mpg with a light right foot. Mercedes is using all kinds of modern engine technologies in order to achieve 181 horses per liter, including spray-guided direct fuel injection, multi spark ignition, a gravity-die sandcast all-aluminium crankcase, forged steel crankshaft and pistons with friction-optimized piston rings, NANOSLIDE cylinder wall technology and air-water charge air cooling.