With the help of the correct equipments as well as a good battery, you can turn water into HHO or Hydroxy gas, also otherwise more popularly known as Brown gas. This Hydroxy gas helps the fuel in your vehicles to burn more efficiently and also does not give out any harmful emissions. Gas mileage improvements using this technique are possible, but you need to gain some basic knowledge and technical know-how, before you actually convert your car. Other than this, you will also find a variety of other gas mileage improvements that easily be accomplished with the help of appropriate devices.