On a recent long, hot journey in Spain, I was pondering which was the most efficient way of cooling the car. Which of these would be the most effective?
- Switching on the air conditioning, thereby consuming more fuel
- Winding down the (both driver and passenger) windows, thus disrupting the airflow around the car and ostensibly creating extra drag
Let's assume I'm travelling at 100km/h on level road, in a 1.2 litre Fiat 500. (It's a valid assumption, because it was true). Let's also assume that both methods cool me down equally as well.
For what's worth, I went with option 2.