A woman's TikTok has gone viral after she shared a hack on how to save fuel.
The TikTok user, who goes by the username @megansbubble, left drivers amazed when she revealed the function of a specific button - the switch featuring a curved arrow inside a car.
The button recirculates the air inside the vehicle, Megan said in the clip.
"So if it's extraordinarily hot inside of your car when you first get in, you want to turn this off so that you suck in the outside air," she said.
"If you're sitting in front of other cars, where you'll be getting all the exhaust fumes sucked into your car, you use this button so that the air inside your car recirculates and you don't suck in all that bad air."
As reported by Mirror, AA UK spokesperson Luke Bosdet confirmed that knowing about the button can help save money on fuel.
"If you don't know what the recirculation button does and have been blasting the air con to try to cool passengers in the back seat, you've been missing a trick and paying for it."
Many people commented on the video, which has over four million views, admitting they had no idea of the button's function.
One user said: "I thought it was to make air go to the backseat."
Another commented: "Thought it was used when getting into an accident to rewind."
