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Maybe add polycarbonate angled panels that smooth the sides into the Kamm back? This would let the light through, and it would help the air flow on the sides. The plastic could also extend down to the bumper, giving the proper departure angle for the sides, too.
It is not obvious that the Focus hatchback has rather *average* Cd -- about 0.36, and much of the drag has to be coming from the back. I drove a 2002 ZX-5 for 3+ years, so I am familiar with the shape.
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