DmaxMaverick...

I see your point, to a degree. However in this condition I must respectfully disagree. I think your comparison isn't apples to apples... or well it may be but in an orange basket. In the setups that use the electric powered fans they are thermostatically controled!! Meaning if not needed they can be turned OFF. In this situation where mileage is the goal the ability to turn a power requirement OFF would be invaluable!! This is why our oems have clutches... but they still draw power when off. Apples to apples I agree that an electric unit is less efficient when operating, but in a 500 mile cruise where an electric fan may come on for... let's say 50miles of that 500 while the oem unit has been operating in full or partial mode for the entire time. Also, I'm sure that the OEM setup could be reduced in size and or speed to lessen it's draw but you will in turn reduce it's effectiveness by the same measure. The electric would still be there when you do need it.