A car with an air conditioner running will burn slightly more fuel for a given distance, which means greater emissions. A car running with the air conditioning off can be 20% more fuel efficient than a car with it on. For driving at high speeds, however, the drag associated with open windows will also reduce fuel economy. Fuel economy experts have differing opinions, but there is some consensus that if you’re driving at 45 mph or greater, for extended distances, then the A/C is a better option than driving with windows open.
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