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in theory they could help but I don't think they will "as implemented or designed"
we know "golf ball" dimples will help by making the turbulent air more energetic allowing it to follow harsher contours than it could otherwise IE reducing "base drag" (that is what we call it in rocketry not sure what its called in the automotive industry
anyway they are way too big. they add frontal and base drag ie will never offset its own frontal and base drag not to speak of the car's
made significantly smaller and placed correctly they CAN help. alas its a T&E issue as non of us understand the math of the fluid dynamics nor can we model it to figure that stuff out.
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