The ECO start-stop function can reduce average fuel consumption by momentarily switching off the engine when the vehicle is at a standstill (e.g. at the traffic lights or in a traffic jam).
If a vehicle is equipped with the ECO start/stop function, a starter/alternator is installed in place of the starter. Intelligent control electronics allow the starter/alternator to supply the electrical energy for the vehicle’s electrical system and, in starter mode, the torque required to start the engine.

Significant savings can also be generated by a series of small contributions. With the aim of reducing fuel consumption for the SL Roadster, Mercedes-Benz engineers examined the energy requirements of all important assemblies and developed ways of getting them to work even more economically.

Overview of efficient energy management measures:

The new BlueDIRECT V6 and V8 engine generation incorporates measures such as downsizing and petrol direct injection. The V8 engine also features two compact turbochargers for fast response. Using the innovative BlueDIRECT engine technology, emissions and fuel consumption were reduced by up to approx. 24 percent compared with predecessor models.