See also:

Switch off the engine during longer stops
Switch off the engine during longer stops, e.g., at traffic lights, railroad crossings or in traffic congestion. Fuel savings are achieved after the vehicle is switched off for only approx. 4 s ...

Start/Stop button
The concept Pressing the Start/Stop button switches the ignition on or off and starts the engine. The engine starts if the brake pedal is pressed when you press the Start/Stop button. ...

Remove unnecessary cargo
Additional weight increases fuel consumption. ...