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One more point. As the rear spoiler on the Insight is made higher, so the pressures in front of it will increase (ie reducing lift and drag). But the spoiler is creating its own drag, so for lowest drag, it's one thing fighting the other.
In a video I have coming up on my YouTube channel, I show a Porsche diagram that Dr Wolf was kind enough to give me (I sent him some pics and a description of the Insight rear spoiler) that precisely shows the trade-off of different height spoilers on a 911 model - drag versus lift... and yes, there is a sweet spot.
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