That angle is too sharp to taper effectively, and you don't want to be building some sort of boat tail extension I've heard you say. Seems like your best option is to taper the trailing Edge of the wheel well skirt a little and create a box cavity like separation point at the tail end of the car.
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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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