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the angle of the windshield is relatively trivial in terms of effect on vehicle's overall drag.
if the angle is too steep (vertical), air stacks up on the bottom of the windshield until it forms a bubble, and air flows around it.
if the angle is too shallow (laid down horizontal) internal relflections are an issue for the driver in differing light conditions - you get nasty reflections off the dash.
frontal area is king. back of the car is form drag, which is queen. The rest of the car are merely pawn upon the winds of drag.
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