You know that's a hoax right? It violates the second law of thermodynamics.
No it doesnt.
do your research, talked to the Physics dept at UCD.
electrolysis splits the H2 from the 0. thus the H2 has a bond which has energy(which can be released when bond is broken) , when used with a catalyst (such as gasoline) it creates a much more efficient burn. Doesn't add power or torque, it's merely a catalyst to the combustion.
If you still dont believe me get:
tub
Battery
jumper cables
Two stainless steel pieces of metal.
baking soda.
lighter
attach two pieces of metal in tub attached to corresponding jumpercables on battery. put in water with baking soda. and watch bubbles form from the water. some is oxygen some is H-H (covalent strong bonds). Take the lighter and ignite the bubbles they blow loud!. HAve fun with dangerous chemistry with your kids!
I have done this myself, and sick of hearing it as a hoax. it works.