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Originally Posted by Cyberbilly
Putting in an electrical fan may buy you a little savings because of less friction, but a mechanical fan or an electrical fan with the same cooling power will require the same amout of energy to operate.
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But, Cyberbilly, isn't the point that a mechanical fan is operating and creating a load even at speed when it isn't needed? An electric fan turns off when the forward motion of the vehicle is pushing air past the radiator, thus no fan load and better MPG.