It is very important to ensure that your tyres always have the correct air-pressure. This small check itself not only prolongs the life of your tyre but also improves fuel consumption. The air-pressure should be ideally checked when tyres are cold, since tyres that have been driven for sometime build up heat inside, and will show incorrect pressure. All tyres do not wear uniformly. Hence they should be rotated (i.e. their positions interchanged) as recommended in the owner's manual. Rotation may be done between the four tyres or between all five tyres (i.e. the spare tyre too). Check for a specific pattern of wear-patches on your tyres. This indicates that the suspension may not be proper, and is hitting against the tyres at specific points causing scuffing. Pulling of your car to either side means that either insufficient air-pressure or that the wheel-alignment of the car is faulty. Regularly check the tyres for small stones and metal pieces that may get lodged in the grooves.