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post #9 of (permalink) Old 10th July 2006
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Originally Posted by sleepdeprived
Any one know what uses more fuel, windows open or air con?

My guess is in traffic air con will use more fuel

On a freemoving towards fast road window open uses more fuel.
They did this on Mythbusters, and concluded exactly that: Below a certain speed, open windows and no air-con was the more economical option, and above that speed, closed windows and air-con gave better economy.

I think the magic speed was somewhere around 45mph. I suppose it would vary from car to car though.
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