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So I take it that a roof spoiler with side spoilers that is overall about 3+ inches long and without an upward lip might reduce drag roughly 0.008 if I do it well and get lucky.
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I'm not the expert here, but I'd point to the longitudinal vortexes generated by VW Beetles and Tesla's Cybertruck. 3 inch spoiler, Okay, but longer side spoilers (until it hurts sightlines).