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Except for Bonneville, you have to ignore race cars - they are designed for down force, not efficiency.
The old Railton Special is still the clearest illustration of the best practice. It is your basic elongated teardrop shape, smoothly modified by widening and squishing the proportions vertically, more on the top than the bottom, to allow for the ground interfering with airflow. The tip of the tail is at the same height as the stagnation point at the front.
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