[dwcsr]

Electric fans do reduce hp loss by not running nearly as much as a mechanical fan. Mechanical fans get their max CFM at max rpms as do electrics. Electrics can get their max rpm when the engine is at idle OR 6k rpm. Mechanical fans get their max rpm and max engine speed. Not efficient at all and not usually needed at 60 mph.

Converting mechanical to electrical energy is efficient if you know how DC motors work and is the main reason we don't use AC current in cars.
DC motors generate some of the power they use to run. ( I'm not going to explain why, look it up).

Electrics run 25% of the time a mechanical fan runs. You can't help but save HP loss.

All Fans need a shroud to work properly.

Keeping a tight engine temp is good for ALL engines not just aluminum blocks.

Most aftermarket fans are garbage and only sever to fix an ascetic issue where a big ass mechanical looks bad or won't fit.

Almost all aftermarket fan CFM specs are not close to advertised.

Most electrics are setup incorrectly to do any good. Slapping a 16" fan in the middle of the radiator and expecting it to cool is a waste of time and money.

OEM fans are designed to cool without regard to looks and do a good job when applied properly.

And the biggest internet myth on cooling..... Mark VIII fans put of 5000 to 5500 CFM.....NOT EVEN CLOSE.... 3200 max on high is a big wind.