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Just went out to the shed, have an old spa pump motor there, it probably pumps about the same or more than most auto pumps, it is rated at 500w, so about 2/3 of a HP. i think this the ballpark area you would be looking at, there may certainly be transmission losses in the belt, but not to the tune of 5-10HP by my reckoning.
It is a fact that there will be an optimum speed for any pump on any system and you may be able to do get that all the time with an electric pump and save a little bit of energy, but heresay will not cut it, you need to know what the desired flowrate is through the engine to maintain thermal integrity. Coolant temp is fine as an indicator for fan requirements, but not for pump requirements, how do you know if you are circulating the coolant fast enough?
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