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With a full grille block on a hot summer day, just moving the temperature control dial to Hot will measurably drop the coolant temperature. This is with the fan turned OFF. Based on that, I conclude that it cools the engine even with no fan blowing, so I leave it on Cold until it's fully warmed up.
With a 10 mile commute, a tiny aluminum engine, and heavy use of EOC, that's pretty much never. I practice dwg (driving with gloves).
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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