Why wouldn't you just save the space and weight in the car, and generate the HHO at home, then store it and use it in the car? You'd get better overall fuel efficiency that way, since you're not carrying around a generator and a few deep cycles.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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