pressure
If you'll check out Motor Trend's article on VW's Jetta hybrid land speed record at Bonneville,you'll notice that at 187-mph,the stagnation pressure is only 1/2 psi higher than at 70-mph.
I don't know if 'normal' highway velocities are going to be of help.
Even at 420-mph we're only looking at around 4-psi.
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