In fact, out of 155 countries surveyed in a recent study from AIRINC, a research firm that tracks cost of living data, U.S. gas prices were the 45th cheapest or the 108th more expensive if you prefer. But that’s just one side of the story as these studies do not take in account salaries or exchange rates for that matter. What we’d like you to tell us is how many gallons or liters of unleaded petrol / diesel you can buy with a month’s paycheck. And to help you out, 1 US gallon equals 3.7854 liters. Leave your answer in the comment section below.