u have to have some air in the wheel ro you'll overheat the brakes. and if your going to put tape on your car for arodynamics, put clear packing tape on. the other looks like duck tape is holding up your front bumper :S
You can't even see it unless you go under the car. Hopefully it does it's job and makes the air go straight under the car unstead of hitting the tire well. I'm trying to get 40mpg at 65mph. I'm almost there.