For proper maintenance of your car you should check your tire pressure monthly. In addition, proper tire pressure can save considerably and consume less, to the benefit of the environment and our pockets.
If the pressure of your tires is less than the optimum level there is an extra-fuel consumption variable between 2% and 4% due to the increased rolling resistance (+10%), or a greater friction between the tires and the road surface, with consequent dissipation of energy.
The flat tires also involve loss of adhesion and less control of the vehicle, especially in the wet, and increase the braking distance. Furthermore, the flat tires wear out more quickly, for which the last 40% less and must be changed first. To avoid this, check your tire pressure every two weeks if you can, or at least once a month. Air leaks that are deflate the tires are completely natural and every month they reduce the pressure by about 5%.
How do I check the pressure?
not by sight! One may have to drop the tire pressure without its various aspects. An accurate control may occur only with a precise pressure gauge. In addition, you should always measure your tire pressure cold had driven less than 3 km or 10 minutes after turning off the engine. If a vehicle is laden must inflate the tires of 0.2-0.3 bar above the value indicated by the manufacturer.
At what pressure should inflate your tires?
The pressure at which inflate the tire is indicated by the manufacturer for each specific car model, and is reported in the handbook "use and maintenance" of the car and usually on a sticker on the door or on the flap of the fuel. In general, for the utility of the middle class the optimal pressure at which the tires are to be maintained varies between ~ 2.2 and 2.4 bar
Source : www.30percento.it/consigli/24/20.htm
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