The start/stop function switches off the engine temporarily when you come to a halt and then starts automatically when needed.
A text used to be shown on the tachometer when this function was available. This has been replaced with the following symbols when the function is available:
White - Appears in the tachometer when the function is available.
Green - Appears in the tachometer when the function is active and the engine is auto-stopped.
Grey - The function is not available when this symbol is struck through and greyed out.
If no symbol is displayed, the function is disabled.