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right James,
If you just flip the deal to heat and let the ambient pressure at your intake vents push the air(usually its at the windshield hood intersection) it will not consume any energy because the heat comes off the engine.
If you run the fan on low I think that table was like 30 watts. . . or .03 Kilowatts so .04 hp. . . really negligible FE improvement considering being cold is likely to slow your response time and ability to effectively hypermile.
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