One of the thrills of owning a convertible is to take it up to speed with the top down. You can enjoy the air in your hair, but there is a big cost in fuel economy. The air resistance will rise sharply with the top down, and you will use quite a few more gallons per hundred miles. Especially at highway speeds, since the importance of air resistance increases with speed. So think twice about putting the top down. If you decide to do it, remember that it is a luxury you are paying for with gas.
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