Principle of fuel saving: When fuel is flowing to the fuel saver, it magnetizes fuel molecules and puts the molecules temporarily into cationic state. Fuel burning will be more efficient in engine while reducing carbon. The unit can improve your fuel mileage an average of 15% and up to 20%. The unit will ensures your engine high performance and lowers the carbon monoxide and carbon build up inside. Installation is easy without the need for any tools or technical knowledge. Simply strap around the fuel supply line close to the fuel injector rail or fuel pump from the point closest to the burning chamber and tighten using the cable ties provide.