Improve Your Fuel Economy
Windows wound down compared to running the air conditioner. For best fuel economy, it’s not a cut-and-dry answer.
Despite many believing this is a common misconception, air con does in fact increase your fuel consumption. Research has found that by using your air conditioning to control the climate of your vehicle, you can actually increase your fuel consumption by around 8-10%.*
However, as bizarre as it may seem, the faster you drive and insist on winding down the windows, at a certain speed you will use more fuel than the a/c option due to the drag effect on your vehicle.