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Aerohead makes a good point. In the case of the Prius, eliminating the rear lift is only going to reduce a few pounds of drag. And that's assuming you manage to eliminate all the lift, without incurring a drag penalty. So realistically, reducing rear lift should be a secondary consideration.
The main purpose of a drag spoiler would be to clean up the rear wake. It's the same basic principle behind kammbacks and boat-tails. And it also appears to be what the spoiler in the OP is designed for.
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