I wouldn't go so far as calling you a moron - but you forgot one basic element in your logic: if you're able to create a "tunnel" in your car, you would make it more efficient by just letting the air pass through instead of putting any turbine in there...
Still the same problem: the efficiency of conversion between different technologies of energy storage/transport is quite low, so just evading any conversion and minimising consumption is the only way to increase efficiency.
The prius works on the theory that a combustion engine isn't always as efficient as it can be. At low RPM and low loads it is less efficient, so they gain a
little bit of efficiency by charging batteries when the engine runs in the best conditions (right rpm) and uses the electric motor for accelerating from low speeds etc...
The prius isn't that efficient if you consider aerodynamics, thin tyres, low weight etc. The hybrid technology is 90% marketing and 10% real improvement.
If the same results were possible with the tech described here, why would they make it so complicated in the prius?
What could help: create the hydrogen yourself (using grid electricity), compress it yourself (this takes energy too!), put it in the car and use as supplemental energy source. Probably more efficient using a fuel cell and electric motor to convert hydrogen into kynetic energy. Probably more efficient to use batteries you charge from the grid to transport the energy...etc etc etc...
But they are all fun projects and the sheer hope for it to make any difference will make you drive more efficiently (less acceleration...etc read up on hypermiling if you don't know what I mean: it can make for spectacular MPG without mods) so the environment and your wallet will be happy
Good luck!
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