Cash-strapped car drivers are being told to check if their cars have a special button that can slash fuel costs.
The trick will help limit fuel consumption and should work in different types of cars, including petrol, diesel and even electric.
Drivers are being encouraged to have the 'hidden' button as it could save them cash amid skyrocketing prices.
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It will come as no surprise to motorists that an air-con system uses engine power in diesel and petrol cars, and battery power in electric vehicles.
The system usually works by taking the outside air and then heating or cooling it.
However, drivers have now been told that this method uses much more fuel compared to the option which lets the car’s air-con system use the air from inside the car.
If activated, the air recirculation button allows the aircon to use the air from inside the car by drawing it through vents.
The button is usually located around the aircon dial that allows the driver to set the internal temperature. It has a picture of a car with an arrow inside it.
The principle is the same for electric cars as the aircon will put less strain on the battery.
"It could increase your fuel usage by as much as 10 percent, and the effects are particularly noticeable on short journeys.
Despite the reduction in fuel consumption the RAC adds: "Don’t use your air conditioning unless you really have to as it uses engine power and therefore increases fuel consumption.
The news comes as British motorists are facing the highest petrol and diesel prices on record.
The latest RAC Fuel Watch indicates that both prices are still likely to rise.
And, the crisis is not showing any signs of slowing down.
