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Originally Posted by teoman
Soo, you can lug a tank of hydrogen with you and basically use it as a very expensive fuel supplement i.e. burn it with the fuel.
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Surprisingly, if the ambient air is somewhat dry, water injection may lead to a more effective mileage increase than those hydrogen setups.
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Or you can choose to be very ignorant, think that the car’s alternator provides free energy, and try to make some hydrogen from that. In reality the alternator puts a load on the motor making it burn more fuel, about %10 efficiency. Then you make hydrogen with that energy and lose a fair bit there aswell.
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Plus the energy balance is unfavorable, since the combustion of the hydrogen generates a lower output than the power required to break down the water molecules on those HHO devices.