I think it's about 0.5HP and that's at FULL load... standing still turning to full lock. That plus weight savings of a couple of lbs would be all you'd gain. You'd gain more speed by ditching your spare tire, and using EMTs. And only fill up to a half tank of gas.

Winfred... my pump died. The belt drive shaft snapped/bent, was there when the mech took it down for the swap. I think the previous owner ran it dry for a while since there was a slight leak when I bought the car... had to top it off a couple of times before it gave.