Quote:
Originally Posted by AndyB
Anyone worked out which is more economical, having the air on or the sunroof open?
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I don't have any numbers, but it will depend on the speed. At highway speeds(65 miles per hour and up), the drag of an opened sunroof(based on my instant MPG dial) uses up more gas than the air conditioning. But at lower speeds(around 40 MPH and lower) the sunroof and the AC break even.