Why it's on the list: Repairs; FuelNext on our list is the least costly vehicle. The Mazda3 Hatchback only falls under two of the six categories. First up is repair cost. Although it's not a significantly pricey car to fix up, it will still take money out of your pocket if not tended to properly. What you'll really have to worry about with the Mazda3 Hatchback is gas. If you're on the city streets, the best mileage you can hope for is 20, and we all know that during city traffic tempers flare and fuel-efficient driving goes out the window. However, if you're more a highway driver, you can rest a bit easier as it won't cost you as much.