I was looking for a detectable change. The Prius front undertray gave that; the Honda rear undertray did not.
Therefore, as the article states, the rear undertray was, for me, ineffective.
As was done initially on the Prius, the depicted undertray was a trial - if it had made a detcetable improvement, it would then have been further refined.
Re wheel skirts - this was a trial of an undertray!
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