Motorists are being told to stop filling their petrol tank after the first 'click' at the pump.
An industry expert says the practice known as 'topping off' could not only see them waste money as they fill up, but could also inflict on their vehicle as much as £500 of damage.
Graham Conway, managing director of UK leasing firm Select Car Leasing, says drivers should fight the urge to round up to the nearest pound, reports MEN.
