Recently I was handed a flyer for a new gadget that is being sold. It consists of two modules that are attached with sticky tape to the underside of ones gas tank. 'There are no batteries and no wires' yet the gizmo 'changes the resonant frequency for the gasoline in your tank, improving milage'. The price on one these gizmos is no less than $1299 I'm no physics buff, but I know a few things about cars. I can't find any explanation on this. So, is this possible?