Your van or car manufacturer will specify what pressure your tyres should be inflated to. You can find the recommended pressures in your vehicle handbook. It is your responsibility that the recommended pressures are maintained. We therefore advise that you check your tyres pressures on a regular basis.
The main reason you must keep tyres to their recommended pressures is driving safety. Under inflated tyres can result in over heating and over inflated tyres can adversley effect your vehicle’s handling. Furthermore, over inflated tyres will suffer more wear and will therefore not last as long. Underinflated tyres increase resistance meaning that more fuel is needed to maintain speed.