[Beau_Jester]

"Yes, the devices do use electrical power from the engine that is ultimately created by the fossil fuel, but the gain in efficiency of the engine exceeds the energy loss from generating the hydrogen-oxygen mix."

I challenge this device as impractical and cannot possibly make enough O2 or H using electolysis and a 12volt to 15 volt source. The volume and speed of production is not there.

As an experiment: get a large plastic tub of water, 2 mayonaise jars, a car battery, some copper stranded electrical wire.

1. Fill the jars with water and invert them inside the large tub of water with the mouths down as to make a water seal.

2. Cut several pieces of wire to go from the anode and cathode of the battery with one wire going into each jar (+ jar 1 and - jar 2). Only strip the wire exposed inside the jars..not outside..and at the battery connection.

3. Observe electrolysis in action. One jar will begin to fill with O2 and the other H. There will be twice the volume of H (H2 0 = water).

5. Use a clock to time how long it takes to fill each jar and then calculate the volume of gas produced and then tell me if this is practical.