its regulation in some countries to have a certain % of a tyre covered by a bumper or wheel arch. nothing to do with aero. I also thaught the same until I saw this article.
see below
Ford Fiesta : Test Drive & Review - Team-BHP
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What is this mysterious little flap? It was an add-on so the car could meet homologation requirements in certain countries that require a certain percentage of the wheel to be covered by the wheel arch.
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