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I will concede that this tuft test was deceptive; there was definitely a lot more movement on the second video with the covers on. However, uncontrolled environments are, as their name imply, unpredictable. No force was ever measured here, only tufts movements resulting from vectors that might or might not have been the same between runs. Every controlled test I've ever seen tells me wheel covers reduce drag, so I'll stick to SAE papers results to tell me what works and what does not for the time being.
The results were were quite entertaining to look at. Keep on the good work. You might want to give a couple coast down test a try.
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