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Fuel mileage is not really a concern when you buy a $150,000+ car. I believe that they were trying to keep very close to the original car.
If you would like to see better aero look at the new Corvette ZR1. It is really good. I have had several chances to get up close to one and poke around. Chevrolet spent a lot of time on the front of the car with particular attention paid to the front wheels. There is a small lip around the front of the wheel well that is supposed to improve high speed stability. The back side of the front wheel well has black plastic molding inside that makes a convex curve behind the wheel.
The bottom of the car is nearly flat and the back has diffusers and sharp edges to cleanly separate airflow. The roof has a lower center section that I believe has some benefit for reducing lift and keeping laminar flow all the way to the rear spoiler lip. It is a work of art. I'll try to get some photos up later
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