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ducting
Auto makers have attempted to make the wheel cavities air tight,other than for brake cooling and engine bay hot air extraction.
If air can essentially 'pool' inside the wells,the outer airflow will skip over the stagnant air as a flat pebble on water.Some rear deck spoilers are designed on this principle.Holden aero-modded a Commodore for racing,using such a 'birdbath' rear boot.
In addition,if you rob air from the 'outside',you're taking energy away from air which already has a direct path to the back,jeopardizing the boundary layer and setting yourself up for even more separation than you already have.Which can only increase drag.
Remember,streamlining is a lot like algebra.Whatever you do to one side of the equal sign,you've got to do to the other.
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