The Fuelshark Won't Save You Gas Because It Runs On BullshitJason Torchinsky12/10/13 12:10pm58173EditPromoteDismissUndismissHideGo to permalinkYou may have heard about the Fuelshark. According to the package, you may have seen it on TV. That same package also says the Fuelshark will save you 10% or more on gas, and all you have to do is plug it into your cigarette lighter. Too bad the Fuel Shark is bullshit. And it's $39.95 worth of bullshit.