Puts those hydrogen injection systems to mind. Those systems that you put water in and are supposed to extract hydrogen and inject it into the fuel stream to give you more gas mileage.Problem is you don't get something for nothing. It drains power and the extremely small amount of hydrogen has no real benefit except to put money in the sellers pocket.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!