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Originally Posted by brucepick
I can see the final cross sectional area is still pretty big. That's what determines the overall size of the wake, correct?
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Correct, assuming attached flow to the cut-off. It's not significantly different than the Prius rear end.
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As for the rest - if they really want to drop the c/d, the car needs a full belly pan.
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If they have in fact managed to beat the Prius 0.25 figure, you can be sure they have paid attention to smoothing the underside. The bottom of the Volt's battery pack itself will be flat, and it occupies a significant amount of the underside real estate.