This uses a 25x1cm steam plasma tube at 4 atmospheres. When running, we power up a storage battery, and as with present cars the fusion snaps back into life: and no, I will not tell you how.
The fusion tube will drive a 8kW thermoelectric pad. So we need 160kW of heat: read https://thermal.ferrotec.com/technology/thermoelectric-reference-guide/thermalref13/
No gear box or clutch – though we use power electric to vary the frequency of the AC, to control our speed. We drive a motor at each wheel. And have a serious radiator, to condense our steam. We vent the he and O gases to the air, And circle back our water.
The car uses 3.5x10-19cc of regular water – if we drive like an idiot. We use oil for lubrication, but burn no Fossil Fuels. Producing no radioactive waste.
We only produce He and O gases – like a field of growing barley does. No petrol or diesel.
The problem may be we produce so much power. So we install an ironing board, so you can catch up on your ironing on the way to see your mother. Obviously, the passenger does the ironing.