Last week, the price of gasoline in Portugal was C$ 2.50 per liter on average. This is subject to change based the city you visit, time of year, and the country’s current economy. If you change your mind about renting a car in Portugal, Egypt has some of the lowest gas prices in the world at C$ 0.42 per liter as of last week. Hong Kong, in comparison, has on average the most expensive prices at C$ 4.42 per liter but is still a great option for those looking to rent a car.