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If there was any improvement it'd be infinitely minuscule. I've got one on my car, I think the main goal of U/D is to improve mechanical advantage under acceleration of the motor... as I posted elsewhere, the alternator still has to charge the battery, power lights, heater fan, ignition, etc, so the same amount of work has to be done regardless of pulley size, the alternator pulley in an U/D setup turns slower, so it has to turn longer to generate the same output. In performance applications thats fine, because this delays alternator output into the future once the car is cruising, freeing up power during hard accel. As far as mpg's I don't see it changing anything, its still a burden (smaller but for longer duration) on the motor. A lot of money for a net-sum zero add-on in my opinion.
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