Airfoil, other "V" wind deflectors, and one lead duck

I like NASCAR. It amazes me that a 1 inch square piece of tape on the grill can make 3 mph difference. The EV1 had a drag coefficient of .29 if I,remember correctly. Sorry to ramble, just thoughts come to me sometimes..Ha! I have been to Ford & GM's proving grounds in Arizona and Detroit. It is amazing at the engineering resources devoted to aerodynamics. I have also toured Article Fox's factory. Great group of people but no wind tunnel. :)