You might get a chuckle from the FAQ for this product:
http://ezfuelsaver.com WHAT IS EZ Fuel Saver?
EZ Fuel Saver is a revolutionary device that was developed a few years ago in Japan, and has since sold over a million units worldwide. It has been tested and proven to increase your vehicles MPG by up to 30%. Of course results will vary based on driving/ road conditions, driver behavior, climate, and type of vehicle.
? DOES EZ Fuel Saver WORK IN ALL VEHICLES?
Yes, in about 99% of all vehicles, as long as your vehicle has a 12 volt cigarette lighter socket to plug the EZ Fuel Saver into then it will work. It works in both gas and diesel engine vehicles.
? HOW DOES EZ Fuel Saver HELP MY CAR?
EZ Fuel Saver will increase your average MPG up to 30%. It will help improve horsepower, give your cleaner emissions, prolong the life of your vehicle’s battery, and help power your vehicles electrical system.
? HOW DO I INSTALL EZ Fuel Saver?
Just plug the terminal end of the EZ Fuel Saver into your car cigarette lighter socket and it will start working immediately. Anyone can install it in only a few seconds.
? HOW LONG WILL IT LAST?
Under normal conditions the EZ Fuel Saver will last between 3 and 5 years depending on how many miles you drive per year.
? WHEN DOES IT START WORKING?
EZ Fuel Saver starts working as soon as you plug it into your vehicles cigarette lighter socket.
? WHEN IT STOPS WORKING WILL IT DAMAGE MY VEHICLE?
No, the EZ Fuel Saver won’t damage your car.
? SHOULD I REMOVE IT FROM MY CAR AT NIGHT?
No, you can leave it installed 24/7, and since it only uses a small LED light it won’t drain your vehicles battery anymore than the clock on your radio. But if you aren’t going to drive your vehicle for at least one week, we recommend removing the EZ Fuel Saver.
? IF I STOP USING IT FOR AWHILE AND THEN REUSE IT, CAN I DAMAGE MY CAR?
No, the EZ Fuel Saver won’t damage your car.
? CAN I ATTACH EZ Fuel Saver TO CIGARETTE EXTENSIONS?
Yes.
? CAN I INSTALL MORE THAN ONE EZ Fuel Saver IN MY CAR?
Yes, but it won’t dramatically increase the effectiveness and the results may only increase slightly.
? TECHNICALLY SPEAKING, HOW DOES EZ Fuel Saver FUNCTION?
The EZ Fuel Saver is somewhat like a battery, it capacitors act like tiny storage batteries that charge and discharge rapidly. Made of two plates separated by a thin insulator or sometimes air, when one plate is charged negative and the other positive, a charge builds up and remains after the current is removed. When power is required, the circuit is switched to conduct current between the plates, and the charge is released, thus causing your vehicles electrical system to not work as hard which helps improve fuel economy, and helps make your vehicle last longer.
? WILL EZ Fuel Saver SHORTEN MY BATTERY?
EZ Fuel Saver is like a secondary battery in your car, so it will reduce your current battery load and make your battery life last longer.
? WHAT IS THE DIFFERENCE BETWEEN EZ Fuel Saver AND SIMILIAR PRODUCTS?
EZ Fuel Saver is unique with its 3 in 1 system and it only uses high grade electronic components and that means its more heat & vibration resistant compared to other devices. Plus EZ Fuel Saver can withstand all kinds of weather and humid conditions to protect the circuit inside. And it is the first product on the market that was designed for in-car cigarette-lighter socket plug in use. Unlike other products that need to be installed inside the vehicles engine compartment by professional mechanics.