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Water is not an energy source.
Despite that, HHO injection can improve fuel economy. Any combustion process is not 100% efficient, there is always unburned fuel that ultimately gets expelled with the exhaust gasses.
Don't look at HHO as a fuel, look at it as a catalyst.
I think the claims on petrol engines are hard to believe, but it is well known that the addition of propane to diesel combustion increases power and significantly reduces the amount of unburned fuel in the exhaust by promoting a more complete burn.
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