Tyres lose around 1-2psi per month (3-6%) naturally so it's important to check them at least once a month and before long journeys. And remember to check the spare tyre as well!
Different vehicles require different levels of tyre pressure
The correct tyre pressure for your vehicle can usually be found on a plate located on the driver's door, inside the fuel filler flap or in your vehicle handbook.
Reduced fuel efficiency: When tyres are under-inflated, their rolling resistance increases. This means they need more energy or fuel to make them turn. Think about how difficult it is to ride your bicycle with underinflated tyres! Tyres that are underinflated can reduce fuel efficiency by up to 4%.
Increased safety risks: Vehicle handling, cornering, acceleration, braking and wet grip are all impaired if tyres are not inflated to the correct pressure. Under-inflated tyres are more likely to suffer from a dangerous blowout.
Increased tyre wear: When a tyre is under-inflated, its contact patch with the road surface is concentrated towards the outer edges of the tread. This leads to rapid wear on the shoulders and reduced tyre life.