A plan for hho generators can be found online. hho gas has been looked at experimentally and you will find many entrepreneurs discussing perfecting hho fuel cells in forums as a means to improve gas mileage. As gasoline prices rise at the gas pump more fuel saving devices and diesel additives will become available in your local automotive store. With fuel increasing in price people wanting to know how to increase gas mileage. Many fuel additives or diesel devices claim to improve gas mileage. hho gas is getting recognition as a candidate that is a possible alternative to help supplement gas as a hybrid technology and improve mileage. This hybrid technology can be used with diesel or gas engines and some are using it with success in other types of engines that or running on fossil fuels. You may recall propane conversions on cars and truck well this is similar but the modifications are few, less costly. This DIY hho gas kit can be easily be removed and leaves little trace of its installation. Many people who are building hho generators from plans are suggesting gas mileage improvements from 15 to 40% some are claiming more. When you build a water for gas kit as they are sometimes called you will find that they can easily be built in a few hours. Plans for hho fuel cell should be able to be followed by many entrepreneurs and can be considered a weekend project. It depends on the plans you have purchased but the ones I have allow for parts that can be found in the house, shop or around town saving you a lot of money. Once you have your hho fuel cell completed you should test it before placing it on the engine to make sure it is producing gas. There is usually plenty of room under the hood of a car, truck or SUV to place 1 to 6 cells. More hho cells are sometimes added to further increase gas mileage.