[Sunwapta]

Do wheel wells need to be completely skirted in or would a leading edge spoiler direct air flow across the openings and reduce turbulence?

It seems to me that a leading edge curved-outward deflecting spoiler could push direct airflow out far enough to miss the scoop effect of the rear edge of the wheel well. (Just as front air dams reduce turbulence below the engine compartment.) Then one could tinker with the turbulence within the well itself with an underbody spoiler.