How to check your tyre pressures correctly

More than a third of drivers are needlessly increasing their fuel bills and taking extra safety risks by failing to keep their tyres properly inflated.  That’s according to Tyresafe, the tyre safety organisation, which reckons that £700 million of fuel a year is wasted as a result of under-inflation.

“The recent rises in petrol prices are hitting drivers hard, yet many are failing to make one very simple check that could save them hundreds of pounds over the year,” comments Stuart Jackson, the TyreSafe chairman. 

When tyres run under-inflated, their rolling resistance – the force that is needed to make them turn – increases. This means the engine has to work harder and more fuel is used, making the car less economical. Calculations from a TyreSafe member show that when tyres are under-inflated by just 20% (around 6psi), 3% more fuel is used.

As well as the extra running costs, vehicle safety is also compromised.  Tyres run in this state are much more likely to suffer a blow-out, typically on motorways at high speeds, as excessive heat builds up within the tyre.  Handling and grip are also affected.

1. Check your tyres at least once a month.
2. Tyre pressures should be checked against the vehicle manufacturer’s recommended level, which can be found in the vehicle handbook and on a plate which is often located inside the fuel cap or on the driver’s door sill.
3. Check the pressure when your tyres are cold (ie, when you have travelled less than two miles).
4. If you are carrying a full load of passengers or luggage, or will be towing a trailer or caravan, tyre pressure should be increased in line with the vehicle manufacturer’s recommendations.
5. Make sure the gauge you are using is reliable and accurate.
6. Check the pressure in all four tyres and the spare.
7. When checking pressures, visually inspect the rest of the tyre as well.  Remove any stone or other objects embedded in the tread. Look out for bulges, lumps or cuts.