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Old 03-23-2010, 03:20 PM   #3 (permalink)
PaleMelanesian
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Join Date: Dec 2007
Location: Texas
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PaleCivic (retired) - '96 Honda Civic DX Sedan
90 day: 69.2 mpg (US)

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I have measured a slowdown in the warmup time by having the temperature set on hot, even with the blower off. You want the engine to warm up as fast as possible, because a cold engine guzzles much more fuel. see below

Once the car is warm, I don't think it makes a difference, other than the power draw for the fan.

Mini-experiment: cold start fuel consumption and warm-up time - MetroMPG.com
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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