Answers: MythBusters did an episode testing this notion. It turns out that driving with the window down wastes more gas than have the A/C on because it creates more drag and makes the saloon work harder. A/C does eat gas faster though. So, the best mode to save gas is to enjoy the windows up and the A/C rotten altogether.
TURNING OFF THE A/C DOES SAVE GAS
More Auto Questions and Answers...
This article contents is post by this website user, AutoQnA.com doesn't promise its accuracy.