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Generally, you want the kammback to angle downwards to decrease the size of the separation bubble forming behind the car. I'd create a sloping kammback that extends as far back as rear-view vision will allow. The length of the rear canted glass creates an excellent opportunity to form a large fairing.
Those spoilers shown will not serve to decrease the trailing wake, but will partially kill lift instead. Your car experiences induced drag, which can be fairly significant. By killing the lift you lower induced drag and potentially improve mileage. I doubt the gains would be as beneficial as a true kammback, though.
- LostCause
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