Your seats don't even weight 15 pounds... taking them out will gain zero net fuel savings. Installing a thousand bucks worth of gadets is a waste also -- you can still buy a LOT of gas for a grand. Buy a set of high mpg tires (the rubber compound is harder), take the back seats, door trim panels, headliner, rt side sunvisor, stereo, AC unit, spare tire and carpet/pad out and you may lose over 120 pounds. Lose ten pounds yourself and you MAY eek out another 2 - 3 mpg. Dude, is it really worth all that??