my uncle has been watching the videos on youtube with all of the people who supposedly gained gas mileage by installing a water electrolizer on their car and running the gases emitted into the intake. now ive tried telling him about the conservation of energy law and how that little bit of HHO gas isnt going to make a difference because the MAF sensor on his car will still tell the ecu to inject just as much gas as it always does, however he believes that because there is such a hype on the internet there has to be some truth to the tale. i cant think of a good explanation of why they get "better" gas mileage other than placebo effect and less aggressive driving but i could be missing something. does anyone know of these systems and is there any truth to the claim? i am very interested and if it is true i would like to know how it works and want to try it to my car.