Water fuel is a widespread term on the internet, and a strong effort must be made to distinguish fact from fraud. Any advertisement that says "run your car on water" is obviously manipulative (ie. water as fuel). Water can be used to make hydrogen, and cool the combustion of gasoline, but cannot be used to fuel a vehicle. While the product may be reasonable, the marketing is highly questionable.
The purpose of this page is to elaborate on the ongoing situation and how to properly distinguish fact from fraud when purchasing products on the internet. High oil prices are being used to sell information, but all information is not created equal. The information being sold may or may not be of useful quality, and since there are so many products its hard to decide which products to purchase.
The underlying concept of making gasoline burn more efficiently is real. Gasoline can burn better, and internal combustion engines can achieve better gas mileage with reasonable modifications. The overall process of increasing gas mileage involves producing hydrogen in the vehicle, either with use of an electrolyzer or a hydrogen reformer combined with ECU or carburretor modifications. The addition of hydrogen alone will not increase gas mileage, and ECU replacements can be upwards of $2500. Modifying the ECU requires piggyback systems to adjust signals from various sensors.