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I was doing an open window test (drive down highway with window open and using hand to sense wind pattern. There is a dead air space to the side of the A post. Air comes off the windshield and detaches leaving about an inch or so of dead air. Consequently, I have the above mentioned vortex all the time. Driving in rain with window closed, water on the side window marks out a pretty clear vortex caused by the air flung out by the windshield.
I'm predict that a) vent visor will not create more drag because it would occupy that dead air space and b) rather than cause a vortex that is already there, it may inhibit it by capturing the airflow that is tucking up underneath it.
Unfortunately, I've been too cheap of late to cough up the $50-$60 to experiment. I'm thinking I might try a cardboard test first.
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