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Does it help create it (A+B=AB) or does it disturb the creation of the low pressure and lessen it (A+b=Ab), but still create a low pressure area where AB>Ab>0. (Maybe that should be < as we are talking about lower pressure and not higher pressure, but I think you can see what I'm getting at.)
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I skipped ahead to kach221's response.
Each 'particle' of air is seeking the path of least resistance to repose at each point as the vehicle passes under it (or the air moves over it in the case of snerodynamics). This means lateral flow over the surface. The only shape that avoids this is Thee Holy Template.
Do you know those cylindrical hay bales? Imagine one the width of the bed and 80% the height of the cab, ahead of the half tonneau, and spinning. I think the half tonneau creates a vortex that acts like a solid object in that space.
What your sail panel thumbnails lack is the pronounced bevel the Ridgeline has for a little Coanda effect.