Each press cycles through to another of the four different modes of operation: Hybrid for a mix of
electric and petrol power, E-mode to
drive on
pure electricity, E-save to preserve the
level of charge in anticipation of some EV
driving later in your journey, and Charge, which force the engine to work slightly harder and top up the battery.
The Hold feature as found also on European Volts and near twins Opel / Vauxhall Amperas, essentially «holds» the battery state - of - charge
level allowing for
pure electric driving at a later time in the journey.