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I have been wanting to do this for some time on my truck. The mechanical fan seems to stay engaged quite often, and seems to engage more in the winter than summer, which is odd. There is a noticeable drag on my engine when the fan kicks in. I saw an episode of Trucks! where the host was performing mileage modifications to his truck, and one of the things he did was replace the mech fan with an electric fan. He said he gained a little more than 1 mpg. Not bad.
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