Geneva  - Mercedes launched the E-Class Coupe in Geneva just three months after bringing out the saloon version, describing the two-door as the world's most aerodynamically efficient series-production car.

Featuring no B-pillars and fully retractable side windows, Mercedes says the coupe has a drag coefficient with a Cd-figure of only 0.24. The new, four-cylinder engine consumes up to 17 per cent less fuel while at the same time offering more performance and torque.

A feature specific to the coupe is the Dynamic Driving package offering different suspension setups at the touch of a button. Other features include Adaptive Main Beam Assist, road sign recognition and an automatic emergency braking system.

According to Mercedes, the most economical of the four cylinder engines, the E 250 CDI BlueEFFICIENCY Coupé, consumes only 5.3 litres of diesel per 100 kilometres and emits 139 grammes of CO2 per kilometre.

The improved fuel consumption has been achieved mainly by on-demand activation of the steering and fuel pumps, the use of tyres with low rolling resistance and an alternator control system which takes account of the current driving situation and the vehicle's electrical power requirements. (dpa)