Was considering wickers for my car but really concerned as to what exactly they will do to fuel economy . Now I understand that you don't buy a car like this for fuel economy but if a person plans on doing a lot of highway driving , which I am, it definitely has to be taken into consideration unless you just got money to burn (unfortunately for me that is not the case) so I wonder what exactly the percentage would be? Would 400 lbs of added downforce be like having 400 lbs of sand in your trunk? Love the look it adds to the car but not wanting to make the car harder on fuel. Wish they had designed it where it could be adjusted or even easily removed if desired like on the C7. Curious to hear what owners have to say on this matter.