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I went with a sharper than optimal bottom angle to keep the tail from dragging when entering steep driveways, so there is likely to be some airflow separation going on. But it isn't much, since portions on the rear of a vehicle that are subject to recirculating eddies tend to get coated with grime or salt, and the underside of my boattail doesn't get any dirtier than the top or sides of my car.
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