I have been watching utugi tv and a product by a company calling itself ECO ENERGY SOLUTIONS was being advertised on tv. the product ECO ENERGY SAVER saves your cooking gas consumption by just attaching(with tape) a small plastic bottle containing a "harmless" liquid on the side of the gas cylinder.

Their website is also very comical,


Results (We Are The Real Deal)
Most vehicles will see mileage increases the very first time Eco Energy Fuel Saver is used. However, with many of today's newer model cars and trucks it may be necessary to run several FULL TANKS OF FUEL through the engine, usually 3-5 tanks depending on the quality of your vehicle's engine control unit [ECU] and how it is set by the factory before the computer starts to adjust the air/fuel ratio. DO NOT be discouraged if you do not see mileage gains on the first tank or two as some vehicle's will NOT respond immediately because the engine computer "sets" the amount of fuel that is injected into the cylinder after "averaging" fuel quality over several tanks (some fuel is higher quality than others). Keep using Eco Energy Fuel Saver and the ECU will begin injecting less fuel once it recognizes the better fuel quality and additional energy (BTU's) in the fuel from using Eco Energy Fuel Saver. Once the ECU adjusts the air/fuel ratio, the mileage that you get out of a tank of fuel will increase.

and they still bring people who have used the unit to convince others