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Originally Posted by cliffyballs
I am thinking of having the "butt" of the boat tail rounded is there any aero gain to that?
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No, you want clean air separation, so use a sharp transition from the sides of the boat-tail to the rear butt plate.
You could even extend the shape of the boat-tail a few inches beyond the butt plate, i.e. make the butt plate recessed.
If you look at the rear bumpers and / or taillights of ever more cars, especially eco versions and hybrids, they use a sharp edge rather than curving inward - or they use a sharp ridge somewhere near the start of the curve inward, keeping the curve for esthetics.
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Side note Someone suggested getting an air splitter for the front of the car you negate a belly pan...anyone ever heard of this?
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There's always going to be air underneath the car, so guiding it properly will improve drag.
An air dam and splitter reduce what goes underneath, but they don't eliminate it.