Adding some moisture to the intake charge may actually be beneficial under some circumstances, be it droplets or steam which is what some so-called HHO kits actually provide, but HHO is mostly either pointless or a placebo. Were you resorting to an auxiliary electric motor or an electric pusher-trailer, powered by the batteries charged on the grid, it would eventually be more reasonable, as the efficiency of an electric motor can still be much higher than the electrolysis in an HHO cell.
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