In particular, grid decarbonisation means that distance to break even moves after the car is manufactured.
If you live somewhere that mostly burns coal to make electricity, your break even is determined based on the higher efficiency of electric motors and of the (energy efficient but filthy) big stack coal generators compared to the relatively clean but inefficient gasoline ICE.
But if they start building wind turbines and solar farms, because those are just cheaper and easier - suddenly that distance shrinks rapidly (maybe half) even though for you as an end user nothing changed, because electricity is fungible so you charge a car from the solar farm just the same as from a coal power plant.
If you live somewhere that mostly burns coal to make electricity, your break even is determined based on the higher efficiency of electric motors and of the (energy efficient but filthy) big stack coal generators compared to the relatively clean but inefficient gasoline ICE.
But if they start building wind turbines and solar farms, because those are just cheaper and easier - suddenly that distance shrinks rapidly (maybe half) even though for you as an end user nothing changed, because electricity is fungible so you charge a car from the solar farm just the same as from a coal power plant.