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Most alternators create more electricity than the car needs, so a fair amount is wasted anyways.
I think I have a 130 amp alternator on my Explorer that puts out about 60 at idle. If your AC, lights, etc. are off, there is no way you're using anywhere near 60 amps. Likewise, if I'm cruising at 70 mph, my alternator is going to be putting out near the 130 amp rating. and again, there is no way a vehicle will use 130 amps of 12V electricity. So I don't think it would affect your mileage at all.
The obvious exception would be those who have big stereos (I must admit, I am one). If you're playing it so loud that the voltage dips on big bass hits, then yeah you're energy defficient and the alternator will have to pull a little more engine power to create its power to make up. You can visually see the RPMs dip when this happens, too (at idle), so you know the alt is pulling harder.
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collegekid01 
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