Ah, this brings up an interesting point about recirc and Cd. In my VW Jetta, when I travel at highway speeds, when I turn on the recirculate for the AC, I begin to hear wind noise near the front of the windshield (passenger side). If I'm hearing it inside the cabin, I'm sure it must be hurting the Cd. I'm not hypermiling my Jetta, but its definitely an interesting thought.
The fresh air intake gets closed, which I'm assuming is why I hear the wind noise. I've planned to tape over the air vents in the front of my Aspire for this very reason.
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