The car also shows the frugal petrol-electric plug-in hybrid powertrain technology and contemporary touch-based interior controls the company plans to use on future road cars.
Called the Intelligent Aerodynamic Automobile (IAA), the four-door saloon features an extendable body that provides it with a drag coefficient of just 0.19 in its most efficient ‘long tail’ form.
The dimensions and silhouette are said to preview those of the third-generation CLS, due out in 2017.
The IAA automatically switches from ‘design’ mode to aerodynamic mode when it reaches 50mph, with elements in the tail section extending to increase overall length by 390mm. At the same time, flaps in the front bumper and louvres in the grille are deployed to improve airflow around the wheelarches and underneath the car.