Its an old myth. Truth is, a perfectly working clutch fan is no better or worse than an electric fan. You wont gain any milage. The Mechanical fan is far more reliable, and better for your alternator.
I'd only ever recommend an E-Fan when:
You only ever do stop and go traffic in the hot summer
Engine compartment space is a concern on custom applications
You simply can't purchase a clutch fan for your particular car anymore.
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