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As other have said, I doubt very much that even Ford's design engineers never made any such measurments, it's completely irrelevant at any legal speed and only marginally relevant at any speed between the legal limit and 100 MPH.
It's decoration. Almost all are. I read an article years ago about a 200 mph Camaro. It had twin-turbos and they wanted to hit 200 on the test track. They couldn't get past 198 until they took the spoiler off. They then hit 201.