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They were taking a real world race engine and dynoing it, it must be more than a few Hp , I'm talking the old steel type because every car today has either a clutch fan or a electric one, It did seem high , I figure though it was at least 6 hp otherwise the belt would slip . I was quoting the article. I think if you can feel the difference its got to be 5 hp difference , not cruising of course its accellerating the fan, I put a bigger alternator pulley on my truck and you could feel the difference right away, if you are in start and stop traffic it is a big difference, due to the idecrease in momentum of the heavier part, thus a fluid clutch or electric willl be much better in city driving MPG than highway where you are steady state, Think how much power it would take to accelareate a four of five pound steel fan with pulley to 5000 Rpm in a few seconds thats where your power loss is. I forgot the math on doing the calculation but somebody could figure it out I'm sure
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