They did a hydrogen fuel cell car on top gear a while back, I think it was Honda,JM said it was the future as it had no drawbacks like battery / electric,he thought it was so good it would probably not get off the ground as the fuel companies would never sell the hydrogen as profits would be decimated, also technically no road tax if based on pollution output as there is zero pollution it only produces water.
I think that the fuel companies / governments will always destroy the chance to use any form of cheaper fuels, as they will both loose so much money,only when petrol / diesel is run out will alternative fuels become available, so we have to wait till Mad Max is the scenario, and carry on paying through the nose..