As a Supplement True, the combination of HHO gas and hydrogen cannot (in and of itself) increase fuel economy, but there is another possible avenue for efficiency increases while using the gas. HHO Generators contains 1/3 oxygen by volume and 2/3 hydrogen (which has an octane rating of 130). 

  hose two factors alone can help the engine to more efficiently burn the gasoline it normally ingests. More gasoline burned means less going out of the tailpipe. Some engines can sense combustion efficiency by "listening" to the sound of the combustion event in the cylinder; if such an engine were to detect the presence of a high-octane fuel and oxidizer, it might well increase ignition timing to capitalize on it. Increasing ignition timing makes horsepower, which can increase fuel economy. 

  The oxygen generated by HHO systems could theoretically reduce emissions for the same reason they may improve fuel economy. More oxygen in the cylinders more thoroughly combust the fuel, so there are fewer unburned hydrocarbons exiting the tailpipe. Another aspect to consider is that the HHO actually displaces some of the natural air that would otherwise enter the cylinder.

   Earth's atmosphere contains 78 percent nitrogen, which converts into harmful nitrogen oxides (NOx) emissions in the cylinder. Less normal air means less nitrogen in the cylinder, meaning there is a very real possibility that HHO generators could help to reduce NOx (nitrogen oxide) emissions.

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