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Is your pulley set aluminium? This should lower rotational mass and improve acceleration. I have no idea how much the reduced weight can improve acceleration. It would be neat to see some dyno or 1/4mi runs to quantify this.
It's unlikely you will observe a measurable MPG increase that you can confidently attribute to the pulley set. My best guess based on the research I've done online is that you might get 1% better fuel economy. This is within the margin of error for any test you would do to quantify the savings.
I'm happy to hear your butt dyno is noticing the improvement. I installed an expensive aluminum underdrive pulley set on my TSX, but did not notice any difference. Perhaps I didn't have enough time in the car in stock form to calibrate my butt dyno before I installed the kit.
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