Quote:
Originally Posted by landsailor
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Might add humidity level, in-town/stop and go traffic, electric fan vs. full time mechanical fan vs. temp. activated mech. fan
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Higher humidity increases the specific heat of air which makes it cool more effectively, lessening the required opening (which seems backwards, but that's because humans rely on evaporative cooling, which decreases in effectiveness with increasing humidity). Instead I just used a number for dry air. So you can reduce your grill opening in coastal areas, but only by a percentage.
Stop-and-go traffic is too complicated for me. At low speeds your fan may turn on to compensate for low air flow. Other than that, if you're staying off the brakes and getting good gas mileage, grill opening demand should be no more than a little higher than at cruising.