Petrol in Italy costs €1.74 per litre as of last week. If you plan on hiring a car in Italy, then set aside a budget for the cost of petrol based on how much driving you imagine doing. If you change your mind about hiring a car in Italy, Egypt has some of the lowest petrol prices in the world at €0.28 per litre as of last week. Hong Kong, in comparison, has on average the most expensive prices at €2.93 per litre but is still a great option for those looking to rent a car.