Answer
If the windows are open, the car experiences more air resistance, reducing fuel economy.
At higher speeds where drag is significant, one may save fuel by closing the windows and running the air conditioner.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 7 - Think and Discuss - Page 130-131: 105
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