www.SmartCarCents.com - Which senario is more gas efficient: using the air conditioner or driving with the windows down??

Which senario is more gas efficient: using the air conditioner or driving with the windows down??

This question regards highway speeds!! Thanks. :o) Opinions are welcomed!

Windows down. My car gets 27mpg average unless I use the air. Then it gets 24mpg.
Mythbusters did an episode on this very issue. Check it out.
The aerodynamics of todays cars is so messed up with the windows open that they are more fuel efficient with the windows closed and the AC on than with it off and the windows down. This is from studies by several manufacturers.
it doesnt make a difference, last week on my news station they tested this, and it didnt make a difference either way. its a myth, they also think windows up and ac on saves a little but not much
Using the AC is more fuel efficient on the highway. Open windows cause drag, reducing your gas mileage.
You waste more gas while running the air conditioner-windows down and freash air is better! If you cant stand the heat, use your air conditioner for a few min and then switch! :)