|Style over substance|
Gas-saving magnets are devices installed on the fuel line line of automobiles that purport to reduce fuel consumption by using a "Neodymium Rare Earth Magnet" that "ionizes the gasoline, changing its molecular structure." Supposedly, these ultra-powerful magnets allow the "hydrocarbon clusters" to more easily vaporize. Though anyone with a basically high-school education in chemistry and physics should know that this is utter nonsense (homeskollars beware!), they are nonetheless sold in the US for around $30 and claim to improve fuel-efficiency by 20%, so you can't afford not to buy one.
In 2004 the FTC brought charges against one magnet manufacturer, FuelMax, which eventually settled for 4.2 million US smackaroons, though the devices are now available to the general public through a totally different company, FuelMag.