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that tuft test really shows the vaacume pockett behind it
From air blowing over wiper. doesnt get more obvious than that.
most cars have a pocket of compression air at base of windshield and it hasnt got as much signature.
I seen tunnel test long ago when chevy did malibu or impala testing and it neatly made small omega symbol there in pocket. they also showed that thier side mirrors helped aero, believing it was impalas.
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