[lunarhighway]

i'm not sure how to read these images, but if these lines represent the path of air mollecules than the drawing only illustrates the path off a portion of the air that would hit the car, so air outside of these lines will likely form an even bigger wake outside of the wheels than what's illustrated.

so air that starts directly in front of the tires seems to need to go round the outside. that might also be what you see in the calibra image.