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Just a small comment
Frontal area x CD gives drag for a non "streamlined" shape,
There are two types of drag - form drag and skin friction
If you can properly streamline a shape such that the air follows the surface, does not detach and rejoins nicely
Which is nearly impossible in a ground vehicle
Then you eliminate "form drag" and you end up with skin friction which is proportional to the "wetted area" and NOT related to the frontal area
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