“no vertical force (ie no lift/downforce) is best for lowest drag” is easy for me to agree with, but I would think that would apply to any given surface, rather than net lift/downforce of the entire vehicle
if the upper surface's lift are completely offset by the lower surface's downforce, then there will be less drag than if the situation were different.
To me, inducing additional downforce goes against “no vertical force (ie no lift/downforce) is best for lowest drag”
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