Pro's Cons
Air conditioning +keeps you cooler - Very bad for the
+more cost efficient environment
- Produces F1's
Windows open +not bad for the enviroment
- you use more petrol for the car to move forward
+not recycled air
The general rule for fuel efficiency is 45 mph. Less than that, opening your windows and turning off AC will help with gas mileage. Greater than that, the drag becomes so great that you'll lose more efficiency than you would by just using your AC.
