If the storage was sorted out it would have a few advantages. Hydrogen has a very high energy density, well it is a rocket fuel! so potentially greater power outputs. But the perhaps the greatest advantage is also its greatest obstacle - its temperature - its a liquid at -252.87°C!
Of course that and its low density (its the least dense gas known to man) make it hard to store. if that was sorted the fuel could be used to cool the engine by being pumped through the radiators before being burned in the engine (just as NASA use it to cool the boosters before burning it) resulting in smaller or even no radiator openings on the car allowing the aerodynamics to be much more efficent.
lastly it could be used to precool the air to the engine making it more dense and increasing power output.
these are just some of my hair brained ideas, feel free to point out where im wrong

your thoughts and comments please