It's 90° out, which will be less detrimental to gas mileage?

[TheLonelyPhoenix]

Unless you're driving 75 mph or more everywhere (where wind drag really kicks in), leave your windows down.

Then again, if you're going through Texas and New Mexico, you probably will be driving in excess of 75 mph.

Take your pick.

 

[RU482]

Originally posted by: nsafreak
Well the Myth Busters (Discovery channel) did a piece on just this subject. Which car would get better gas mileage one with the A/C turned on or one with the windows down. After their experiment in which they drove two identical vehicles around the track with the same amount of starting gas until they ran out of gas the one with the windows down won by a good margin.

I would only call that experiment semi valid IF they did it again with the opposite vehicles

 

[b0mbrman]

Originally posted by: TheLonelyPhoenix
Unless you're driving 75 mph or more everywhere (where wind drag really kicks in), leave your windows down.

Then again, if you're going through Texas and New Mexico, you probably will be driving in excess of 75 mph.

Take your pick.

Not Texas...People get stopped on our highways for going 6 over...