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I would say the wheel skirts and getting the bottom side as smooth as possible would be your biggest gain areas. You also have a relatively new vehicle, so Cd information should be out there somewhere.
Dropping the car reduces the frontal area which helps with drag, so you may want to re-drop it. Also worth noting is unless you have a turbo on that thing you will never reach speeds that need more downforce than came from the factory. (And you would also want the downforce on the front of the vehicle since its front wheel drive)
That wing looks like its going to hurt aero more than help it. I would advise at least testing a partial kammback made of coroplast. Have it follow the same curve as the roofline and cut off at the back of the body.
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