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Seems to me that most (?) high-efficiency concepts that don't go with full front skirts instead pay close attention to the shape of the aft portion of the front wheel arch.
And what do they do?
They make sure they've got a generous radius in the bodywork to ensure that air exiting the wheel well has the best possible chance of staying attached. See: GM EV1, Honda Insight (1st gen.), and many, many others.
I realize this thread is about ducting, but I bet radiusing that edge (even if you simply add material to the wheel well liner) might be a much easier and workable alternative.
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