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Old 07-18-2021, 07:56 AM   #821 (permalink)
In the fasting lane
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Location: Nieuwegein, the Netherlands
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Red Devil - '11 Honda Insight Elegance
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I think they create a vortex, and that helps to prevent the buffeting that would otherwise happen with the window open.
Typically air rolls over the A pillar from the bottom of the windscreen to the sides, and that would then hit the wing on the mirror and be guided upwards.

2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
lifetime FE over 0.17 Gmeter or 0.1 Mmile.

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