Plans for hho generators can be found all over the Internet. hho gas is considered experimental and there are forums that discuss gas devises that help increase gas mileage. As gas prices continue to increase you will notice that more gas saving devices and additives will show up in the marketplace. 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. Most people who have built hho fuel cells from plans have claimed increasing gas mileage of 15 to 40 percent and some have suggested more. When you build a water for gas hho cell you should be able to make one in a few hours in the comfort of your shop. 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. When you have completed a hho fuel cell consider testing it before placing it on the engine to make sure it is producing hho gas. Often there is plenty of room under the hood of a car, truck or vehicle. In some cases more hho cells are sometimes added to further increase gas mileage.