Following its debut at the Frankfurt Motor Show in September, the Mercedes-Benz Concept IAA is back in a comprehensive image gallery and two fresh videos.

Following its debut at the Frankfurt Motor Show in September, the Mercedes-Benz Concept IAA is back in a comprehensive image gallery and two fresh videos.

The Intelligent Aerodynamic Automobile is a very sleek four-door coupe concept with a drag coefficient of just 0.19 and an extendable body. You’ve read that right, the body is actually stretched by up to 390 mm when the vehicle hits 80 km/h (50 mph). It does so to improve aerodynamics even further as a way to make the concept more fuel-efficient. The shape and design of the car can be described as a CLS from the future and it’s impressive that Mercedes-Benz managed to keep the car sexy even though focus was primarily on aerodynamics.

As for the interior, the elegant cabin takes cues from the S-Class Sedan and S-Class Coupe, but with a high-tech twist as most of the functions are now touch-operated. The designers kept the layout clean and functional, ending up with a beautiful minimalist design.

Unsurprisingly, the concept is alternatively-powered as it mixes a gasoline engine with an electric motor to achieve a combined output of 279 PS (205 kW). This plug-in hybrid arrangement enables the IAA Concept to offer a pure electric range of 66 km (41 miles). When it runs as a hybrid, the vehicle will have CO2 emissions of just 31 g/km. This is truly impressive given the car’s large footprint: 5040 millimeters long (5430 mm in aerodynamic mode), 1995 mm wide, 1305 mm high, and with a 2975-mm wheelbase. There’s no word about weight, but you can imagine it’s not exactly light.

It will remain strictly as a concept, but it shows Mercedes-Benz’s continuous advancements in aerodynamic efficiency and this will obviously impact future production cars.

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Mercedes-Benz Concept IAA new pics and videos from Siegerland Airport