Two models.
The cheaper model. £16,000
One person a bit like a twizy with far more generous luggage space.
Ultra capacitor based electrical front wheels and a generator.
This generator is designed to use Fuel that is less rich in hydro carbons more efficiently than a standard engine would do with such fuel it would probably choke on.
The more expensive model. £98,000
A 4 seater car also hybrid and also not one you plug in either but with some solid state batteries requiring a slightly different fuel formulation for it's generator.
Why would it be worth producing such vehicles.
You could lower the carbon foot print where vehicles will still be transitioning from fossil fuels to sustainability.
also such models could have all electric models with solid state batteries as an option starting with a £60,000 Twizy like thing with more luggage.
This can be tuned with R&D and how prepared certain areas of the global electric grid are for all electric whist being greener than standard cars.