I'm typically very suspicious of such things, my general belief if there's anything to give an automaker a leg up on the competition to make profit they're going to do it. Sorry, I just don't go for international conspiracy theories. But in looking to find information debunking such devices I came across the following: http://www.myfoxcolorado.com/myfox/p...Y&pageId=4.1.1

http://revision3.com/systm/waterpower/

There's literally tons of information and misinformation on this topic but fortunately science always comes to the rescue: Typically those who discovered mileage increases actually did so through subconsciously moderating their driving style. The concept of increasing gasoline efficiency with hydrogen is sound, but effectively designing a device to economically produce it in sufficient volume is another matter entirely. If you're not familiar with production of hydrogen from electrolysis do some research into that and you'll find the answer to this question is rather simple.