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Originally Posted by Cd
Ill let the experts take the floor on the question about the vacuum pressure being good or bad.
I was guessing based on a comment from an aero engineer that worked on the UCLA Future Car over a decade ago. The link is dead now, but there was a PDF write up about a partial boat-tail that was created for the car. At the tail end a section was hollowed out - the reason being that it created a bit of vacuum pressure at the tail end and pulled the wake in farther.
As far as having a downward slope to the extention, it might not do a thing, but i can't help but think of the back end of the dodge ESX-3 ( which had a fantastic Cd in the twenties. ( Note the trunk section )
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I think the reason they made it like that is because Americans hate hatchbacks.