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An electric fan runs off the battery, not directly from the engine. So its load is rarely or never borne directly by the engine at the moment of the fan's use. At least it is not easily predictable when the electric load will bring on the alternator to charge the battery. Run it during EOC or during engine-on pulses and I am not sure it will make a difference.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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