With be driven by a steam plasma tube. Smashing water molecules into massive heat, light and X-rays. And Ford and BMW are already looking at thermoelectric generators.
A 50x1cm steam plasma tube at 4 atmospheres produces a constant 1.2MW of heat. We drive a fan, and get 144kW of power – the fan takes 500W.
A car needs 30kW to drive – so we have enough power to fly between cities – using helicopter blades.
And it consumes 2x10-12cc of regular water a year. So we may top up, every 3 years during a service.
The can burn no Fossil Fuels. And produces no CO2, or sooty residue. Petrol – so over priced, and energy poor. So the car makers will continue, the service stations will not sell fuel.