I have been throwing around the idea of testing the efficiency in a standard ice by using 1 bottle of compressed hydrogen directly into the air box. Controlling the flow (how much at what level of acceleration) can be a problem. Additionally the o2 sensors in the car will automatically adjust to compensate for the increased oxy in the works, therefore providing additional fuel to the engine (killing mpg). Making HHO from renewable sources should not be a problem. Heck I would put a solar panel in my rear deck instead of speakers to generate HHO or even trickle charge my HV batteries.

Hold on !!! another turn!!!