I like the spoiler but taper the edges a bit, starting at the point of contact with the body. I have never seen a side mirror sill like you are considering, but I would also recommend tapering it as it goes back from the mirror housing. Those hard corners are going to produce their own problems, possibly.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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