10. Keep those windows closed on the motorway
No one wants to drive on a hot summer’s day without some relief. But should you open the windows or use aircon? Opening the windows when you’re at high speeds can increase your fuel usage but about 20%. If you’re driving over 45 mph, we recommend keeping your windows closed. If you’re under 45 mph, opening the windows is better than turning on your aircon.
Unfortunately, turning on the aircon does increase your fuel consumption by around 10%. It’s still better than opening your windows at high speeds, but over time it will increase into your fuel consumption. Try switching off the aircon when you can to make your fuel last longer.