Hydrogen as an aid to lean burn i.e. "homogenous charge compression ignition" DOES work, but this has been known for a long, long, time and yet as far as I know it hasn't made it out of the lab yet because it requires a much higher degree of control over the combustion process than is available on our road going stuff at this time. Maybe a backyard tinkerer can make it work... maybe not. I'm thinking "not".
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