What oilpan4 said above. And also, the tail end of the current Prius has some pronounced "box cavity" elements: a void between the tail lights and decklid and integrating the bumper cover sometimes to its base and rear diffuser. Google aerodynamic rear box cavity experiements. There are formal papers out there.
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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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