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Tire pressure for cars
Tire pressure for cars

A tire loses some of its pressure through natural causes (typically around 1 psi (0.076 bars) per month). Pressure loss may be accelerated by other air leaks due to:
• an accidental puncture
• the valve: which must be changed each time a tire is changed.
• the valve cap: essential to guarantee an airtight seal.
• the wheel: which should be cleaned each time a tire is fitted.
• Follow the advice of the vehicle or tire manufacturer, particularly with regards to the conditions of use (loads/speeds etc).
• Check pressures when the tires are cold (tires which have not been used in the last 2 hours or have covered less than 2 miles (3 km) at low speed).
• If tires are hot when they are checked, add 4 to 5 psi (0.3 bar) to the pressure recommended by the vehicle manufacturer. Re-check the pressures when the tires are cold.
• Never deflate a hot tire.
• Even if tires are inflated with nitrogen, the pressures and overall tire condition must still be checked frequently.
A correctly inflated tire improves safety, is more economical in use and is better for the environment.

By keeping your tires at their correct pressure, you’ll reduce your running costs. Under-inflated tires are prone to overheating use more fuel and wear out more quickly. Likewise, over inflation can reduce tire life, reduce grip and cause steering problems.
• WEAR
A tire which is 20% under-inflated can give 20% less mileage. That means a loss of 5,000 miles (8,000 km) on a potential mileage of 25,000 miles (40,000 km).
• FUEL CONSUMPTION AND CO2 EMISSIONS.
Low tire pressure increases both fuel consumption and CO2 emissions.
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