The internet is a wonderful thing... People are as divided on the electric/mechanical issue as they are on everything else. I found one article that looked reliable that someone dyno'd a dodge with both types and there was a increase of 4HP. So let's assume that includes the increase alternator load. One thing that was pointed out was better temp control and that I know first hand.
Well, I will know soon enough as I ordered a shroud today. My 2011 escape has electric fans, electric steering...newer cars have added electric water pumps.
__________________
|