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Originally Posted by Lethedethius
Back to my original discussion-has anyone done this with negative or positive results?
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There have been both positive and negative results as far as fuel efficiency. Measured gains have been a percentage range as have measured losses. No "doubling of fuel economy" or factors there about. And, it is not as simple as the HHO aficionados make it out to be.
I have only applied it in passing to half a dozen vehicles/engines to ascertain the parameters of a hydrogen augmented combustion engine so I can't say my information is extensive.
The bottom line is that considerable work will need to be done to gain a 5-15% advantage. An outlier engine returned 30-50% with HHO but that was in conjunction with added intake heat, mixture turbulence and lean combustion mixtures at relatively low engine revolution rates.
As a means to reduce your fuel bill, HHO is an expensive path to follow based on the returns. If you want to experiment and enjoy the challenge of it, then by all means, go for it.