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Originally Posted by 2000mc
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I make that final diffuser angle to be 8-10 deg. This is steeper by far than Hucho would recommend. I do note that the diffuser appears to be curved, assuming the final angle over some distance. It is just another example where details sometimes diverge from the text. It would be nice to see some GM testing, but I suspect it isn't available.
The Honda Insight ends it's diffusion area, which is about 4 deg, with an upward curve molded into the bumper cover. There is also a "fancy" little undercut slot whose purpose appears to be the introduction of turbulence.