You have a nice car serial, and for the miles you plan to put on it, will be difficult to recoup any eco/aero improvement costs.
I'd simply install a chin spoiler perhaps made of conveyor belt material and be done with it.
Driving with the top down is one of the best things about these cars, enjoy it "as is".
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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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