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I think the bit that you guys may be missing is that given the choice, a clean-slate design, with the ability to choose an open-wheel design or a closed wheel design (when it comes to the race cars that you're using for examples), the open wheel design is *always* higher drag. It may be because of the necessarily wide tires hanging out there in the breeze (which may be mitigated somewhat on a low-drag eco-modder design with skinny wheels and tires), but open-wheeled raced cars have MUCH higher drag than their (all-other-things-being-equal) closed-wheel counterparts. Compare for example, Formula Atlantics with their closed wheel counterparts, C-Sports Racers. CSR's are much lower drag.
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