I believe genset+motor is the implementation of some hybrid cars, possibly calling it a range extender. Some others have a combustion engine and motors attached

I believe genset+motor is the implementation of some hybrid cars, possibly calling it a range extender. Some others have a combustion engine and motors attached to the same gearbox (iirc that's the Prius setup). However I'm not very clear on what non-marketing advantages there are supposed to be to having both petrol and lithium fuels on board.