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Originally Posted by aerohead
1) the diagram depicts a squareback and notchback.
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Yes, you're right - my mistake. Otherwise, my point remains - flow wrapping around those upper curves create lift.
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2) for a fastback vs notchback vs squareback comparison, please see Hucho's 2nd-Ed Figure 5.9, page 221.
3) the notchback has a higher CL at 0.5085, than the fastback, at CL 0.4500. The squareback does, clearly have the lowest CL, 0.2390.
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That diagram is for cars (Type 31 Volkswagen fastback, squareback and notchback)
that are 59 years old!
Flow patterns on modern car shapes (eg notchbacks) are quite different. This is a primary cause for your confusion - car shapes (and their flow patterns) have changed, but you act as if they have not.