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You could use those flaps as partial templates for one end of an elongated teardrop-shape fairing. It could be carved from styrofoam, as is used in house insulation and sold at Home Depot, etc.. Or, you could ditch the mudflaps and just use the attach points for fairings.
Look at the rear wheel fairings on a Prius, as a guide.
As for the rear bumper cover, does it act like a parachute and scoop up air that is trying to escape from under the car? See various posts and pictures of Coroplast undertrays.
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