Thanks aeromodder! That is quite interesting. GM must have found that shielding the tires was better than not. But the width of their piece of quite small. I wonder if "tripping" the air flow over that hard edge helps make a curtain of air down the side of the vehicle.
I'm sure my plan would work out better if I bring the front piece out way forward on the bumper... but that is a lot more material, and more difficult to cut & shape. Hmmm....
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