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Covering the wipers doesn't have to cost anything when done smart.
It keeps pedestrians away from the (non working) wipers in a collision, reducing their injuries.
If it gives even a minute aero advantage, that'd be all the better.
Lots of European cars have airfoils on their wipers to keep them from lifting @ speed.
On my car, the blades themselves are shaped like a Gurney-Flap, with the aft edge turned up 90°.
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Strayed to the Dark Diesel Side
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