Tyres
Check your tyre pressure regularly. This is important for safety reasons as it's dangerous to drive on tyres at the wrong pressure. 
The pressure is best checked when the tyres are cold. If you drive a few miles to a garage to use a tyre pressure gauge, you'll get a false reading as pressure is higher on hot tyres. If the only way you can check is to drive to a garage, wait a few minutes to allow the tyres to cool before measuring the pressure.
The correct tyre pressure for your car will be shown in the owner's manual. Some cars also show this information on the inside of the petrol cap. The details may be shown in pounds per square inch (psi) or bars. It is usual for the pressure on front and back tyres to be different.
If a tyre's pressure is low, you'll need to inflate it until it reaches the right pressure. If the tyre is over inflated, you can reduce the pressure by pressing the pin in the centre of the tyre valve.