if anyone is interested I have some genuine snake oil to sell you to put in your car.
gas tabs, miracle plugs, magnets put on your fuel line... only serve to make the joker selling it to you rich and make you out to be a fool.
something not mentioned is getting a grappling hook and launcher to tie into semi's ...
really helps on the gas mileage...
other than that, drive like a granny to get better gas mileage. stop tailgating which causes you to constantly braking/accelerating and lose mpg by causing all that gas you just burned in accelerating to transfer into heat in your brakes and also drive slower. figure out how to use the brake as little as possible ... also no use accelerating to the speed limit when the light a few hundred feet just turned yellow..... i dont know why so many people are in such a hurry to speed up just so they can stop at a red light