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Yep, that would reduce drag in the mirrors' wake.
The biggest problem with aerodynamic air injection systems is they consume an awful lot of air. Where are you going to get the air from? If you use an electric or belt-driven blower, you might not save enough fuel at the mirror to run the pump, and certainly not enough to justify the expense.
If you use a duct, make sure it doesn't create more drag at the inlet than it reduces at the outlet.
Hmm, my mirrors are mostly a hollow plastic shell, and there's a gap between the housing and the glass. If I drill a few large holes near the mirror's stagnation point, I wonder if it would reduce drag, or just whistle a lot.
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