One school thought insists that air conditioners are a drain on the battery and petrol.
Another claims that open windows cause aerodynamic drag, forcing the car to gulp more fuel.
Yes, while sailing along a highway, the air conditioner does steal power from the car engine, but Consumer Reports found that it amounts to only about 1.6 km per litre, worth it on scorching day.
On the other hand, open windows do cause a drag on the car, making it harder, but not by much.
Reader's Digest June 2009
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