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OK Phil, you say turbulence, I say returned energy wasted. I think the turbulence is a result of the air being "Hung out to dry" and not maintaining contact. But the real reason it takes more power when you exceed the template curve is that the air column spring is no longer pushing the car, returning the energy it took to raise it up.
I think that this would explain why sometimes flow is attached when the template is exceeded too, if you look back at Cinderella I had numerous examples of attached flow despite an exceeded template. If the flow is attached, but not really pushing on the car, what good is it? So the template is valid for getting the optimum Cd, there are times maybe when a car shape is faster than the template and flow remains attached, but it isn't giving its energy back to the car. Ha. Making more sense everyday.
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