[Floordford]

At idle the fuel usage per minute could be calculated and it would take the human out of the equation. Granted this would need to be a take your car apart kind of experiment. Probably involving a 3 gallon gas tank with a window and a separate fuel pump powered by the cars fuel relay. The separate battery powering the hydrogen generator would take the alternator load away so that only engine benefits could be seen. With that there should be some kind of result. Even if the hydrogen is acting as a less powerful filler the engine should use less gasoline or fuel but might be ever so slightly down on horsepower. But no one really cares about horsepower at idle. The other result might be that the hydrogen makes the engine idle high being that its much more explosive. Some ignition timing may need to be adjusted.

To test an engine at load a gasoline engine driving a water pump could have a hydrogen generator incorporated. With a set throttle position the gasoline powered water pump should repeatedly use the same amount of fuel. By adding a hydrogen generator powered by a separate power supply it would produce solid repeatable results. Granted its not a car but as soon as a car has a load on the engine usually a person is in the seat. Im trying to take the person out of the experiment.