Mind your speed!

“Slow down! As your speed increases, so does the amount of fuel you’re using (and the amount of pollution you’re creating). According to the AA, driving at 70mph uses up to 9% more fuel than at 60mph and up to 15% more than at 50mph. Cruising at 80mph can use up to 25% more fuel than at 70mph [3].”

https://www.ovoenergy.com/guides/energy-guides/120-ways-to-save-energy.html