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best
I would do a simple yarn and Scotch-tape tuft study to see where the air is going right now.Even though the wipers are interlaced when parked,they may be in a stagnant burble of air in front of the windshield,and not causing any measurable drag.If the air is being channeled at the sides towards the A-pillars,having them in the 180-degree position could actually hurt performance.During GM's development of their 80-mpg PNGV car,they found that the windshield wipers added zero drag.
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