electric water pump on the street

[My5ABaby]

Originally Posted by Pete_89T2

^These are both valid advantages for an E-water pump. Being able to control flow rate independent of RPM helps to optimize the efficiency of the cooling system, all other things being the same, and switching to an EWP should get you a net reduction in parasitic loads at the crank. I say "net reduction" because the electrical power needed to run an EWP isn't free - the alternator will have to work harder (more drag on the crank) to produce that power. The question is does the increase in parasitic drag from the alternator get offset by a larger decrease in parasitic drag from the mechanical water pump?

And to expand on it, is the offset even worth it?