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The third-generation Mercedes M-Class will achieve 'class-leading economy' for a big 4x4 according to the German company's engineers and goes on sale in spring 2012.

Most thrifty is the four-cylinder ML250 BlueTEC 4MATIC, which delivers an average fuel consumption of 47mpg and emissions of 158g/km, despite having 204bhp and 369lb ft of pulling power. Fitted with the optional 93-litre fuel tank, this gives it a range of 930 miles.

The most economical BMW X5 manages 38.2mpg and 195g/km with 245bhp, while the Land Rover Range Rover TDV8 averages 30mpg and emits 253g/km of CO2.

At launch there will also be a 350 BlueTEC 4MATIC with 258bhp, managing 41.5mpg, and a petrol 350 4MATIC BlueEFFICIENCY with 306bhp capable of 33.2mpg that has a top speed of 146mph.

Two of the biggest improvements in economy have come from engine downsizing and class-leading aerodynamics. Friction inside the engine has been reduced using a technology developed by AMG for performance models including the C-Class Coupe C63 AMG.

The nose features a huge grille and long bonnet with aggressive air intakes at the base of the windscreen.

Inside, an enhanced COMAND system has a large high-resolution screen sitting in the central console and offers internet access and apps for Google Local Search plus access to Facebook and even weather information.

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