Quote Originally Posted by ehnriko View Post
Once in the engine, the hydrogen produces a more complete combustion, according to Anderson, which means the engine more efficiently uses the fuel.
I'm just now getting around to reading all of the posts here. This one point is of particular interest to me because I've come to the conclusion the reason less than 1% hydrogen volume compared to gasoline has more than 10% benefit in performance due to the effect small traces of hydrogen have on the primary fuel, especially if that fuel is diesel.

I was reluctant to install one of these as a test on just any car, so I selected a car that would need an engine rebuild just in case there was engine damage. In test drives I would run most of the time with the hydrogen on to get information on mileage improvement. The base line on this particular 3.8 liter vehicle was 12-16.5 miles per gallon with 14 MPG being very typical due to number one spark plug becoming oil fouled during run times. As I ran this engine with the HHO turned on the plug fouling problem went away. I assumed the extra road time sealed up some leaky valve seals in the cylinder head on this engine that had sat idle for 18 years. Then in a two hour run with the HHO turned off the plug fouled, just like before. On a hunch I returned the plug to the cylinder without cleaning it. I ran this car around town for another day or two and the engine miss went away. Pulling the plug showed it to be perfectly clean. The trace amounts of HHO not only cleaned the plug somehow, but I believe the hotter flame point of the HHO was turning the motor oil into fuel. Mileage on this car on the highway doesn't vary so much with the HHO turned on, 24.5-25.3 MPG. Due to my spare time working with the hydrogen cells I've not rebuilt this engine yet, but so far seems to run great as long as it gets the HHO.