Why wheel spats probably won't make a comeback despite aero benefits
As it turns out, covering the rear fender wells could indeed go a long way toward making vehicles more aerodynamic, but the costs and drawbacks associated with applying the pieces are too steep for production. For starters, manufacturers would have to run narrower tires at the rear of the vehicle, possibly decreasing handling prowess at the same time.
In addition, GM found that running fender skirts causes tire pressures to increase dramatically, potentially leading to and increased likelihood of tire failure. That's not something that any automaker wants to induce in a production vehicle.
Then there's the fact that adding fender skirts to a vehicle would invariably add to production costs. At the end of the day, the domestic automaker found that fender skirts simply aren't worth any additional aerodynamic advantage given the risks and costs associated with their use. Oh, and most consumers don't really seem to like them, either...
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