considering all the results from wheel skirts even if the air is still affected on the inside it is not on the outside and the airflow smoothly flows over them avg gains are normally very noticeable. at any speed aero helps the faster you go the more they help but there is a wall were it advances your max speed to keep the same mileage as a lower speed without mods. the reason there is parasitic drag on airplanes even with fairings is because the airflow wants to smoothly flow over the bottom being interrupted by another object
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"The only real mistake is the one from which we learn nothing."
- Henry Ford
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