I'm guessing that because the roof plane is less than 22 degrees that air flow stays attached.
I'll go further in suggesting that the wing adds a small amount of down-force at the expense of a little bit of drag.
Overall a very nice clean car, add a chin spoiler and then drive like a little old lady and save a lot of gas.
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George
Architect, Artist and Designer of Objects
2012 Infiniti G37X Coupe
1977 Porsche 911s Targa
1998 Chevy S-10 Pick-Up truck
1989 Scat II HP Hovercraft
You cannot sell aerodynamics in a can............
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