There's a cool article with ten hall of shame automotive devices that are/were supposed to do something or another to improve your vehicle's gas mileage, performance, and even ectoplasm removal (because I guess ghosts are slowing your car down؟). Popular Mechanic Gas Saving Gadgets (backup link) covers it all. My favorite is the magnets used to "straighten" fuel molecules to improve ignition efficiency. (If anything, the magnets would add more weight to your car, thus reducing fuel efficiency).
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