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If the Drag increases at the square of the speed, I'd think there would be a Huge difference in pressures and flow, between 40 mph and 70, not even to mention 100+, not that 100 mph is much use to most of us here.
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100mph is a worthy goal if you attain and cruise at it economically.
If you look at 3D CDF heat maps, you see they can map velocity and pressure independently. So there are interdependent things here.
The streamlines are persistent between a lower bound (where laminar flow goes turbulent) and an upper bound where subsonic shockwaves start to intrude. This necessarily involves air pressure, vehicle size and Reynolds Number.