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On the Aerocivic, I discarded my wheel covers not too long after I got wheel skirts installed over all four wheels. The air inside the wheel housing is rotating with the wheel so I figured any non-aerodynamicity of the wheel is not going to have much effect in the maelstrom already taking place in the wheel housing. In the Aerocivic, I'm exhausting radiator air out through the front wheel wells, where the rotating wheel acts as a squirrel cage fan to help pull air out of the engine compartment with the adjustable grill block acting as a flow restrictor.
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