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Remember that the top of the wheel is moving forward at 2X the speed of the car, relative to the ground. Even with the partial skirts on the Probe, the one tuft looks like it is getting "sucked in" to the churning air flow around the wheel; even with smooth wheel covers.
I think if cars are going to have any chance of achieving a Cd >0.2 I think they need to have wheel skirts. This is definitely "worth" going after, in my opinion.
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