Hi volume oil pump vs standard volume pump

moper said

I can tell the difference on a cold engine pre-oiling with my cordless drill. Plus there were enough breakages or concerned over it that Mopar developed the heavier drive shaft for them. So yes, there will be power taken by the pump and to probably similar extent, the additional windage created by excessive oil draining back and flying off parts. Just my observations on the subject. I'm not going to worry about quantifying beyond that.

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The hardened oil pump drive isn't a Mopar only thing. The parts catalog lists a hardened oil pump drive for use with HV pumps in every older domestic make. That still doesn't mean you'd ever feel the difference in a warmed up engine a 5000 RPM and up. Its just not a place where "I" would look for "extra" power. I don't want to give up anything in the oiling department.

Opinions vary and that's a good thing. This is a good discussion.