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One thing that's crossed my mind is kammbacking sedans without boattailing them increases the size of the rear area, thus increasing the size of the wake. Hatchbacks can get away with it because their rear ends are already large, and the kamm reduces it. Since airflow still reattaches on the trunk, the "suction cup" isn't as large, even if the air is perfectly clean.
After removing my partial kamm, I couldn't tell if it was even doing much good.
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In Reason we Trust
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