Seems like it would make the car a hair more aero... I'm thinking a solid 0.00938% improvement at a given fan speed, assuming that setting did not also automaticly allow the a/c. However, if you would have been able to select a lower fan speed due to the passive flow, when on a vent setting, I'm thinking you're losing out by.... however much power it takes to spin the fan at one level higher... maybe 0.05% loss.
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