It looks to me like the air on the vette is arcs back down to the hood 14 inches or so behind the light. Keep in mind, I don't mean to say a flat front is the same as an aero one, I'm just saying it isn't as big of a hit as people want to make it. Obviously an aero front helps.
As far as the illustration goes, it's just that, a drawing, someones opinion of what is happening. Interesting though.
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