5. Nissan Sentra FE+S $17,780
If you want fuel economy and don’t want to crack $20,000 for it, the Nissan Sentra is the most affordable compact that delivers 40 mpg on the highway. The FE+S trim package adds the CVT engine to the 130-hp 1.8L engine, and helps it reach 40 mpg. The FE+S trim package also adds a rear-spoiler, aerodynamic underbody panels and low-rolling resistance tires to help the car reach that 40 mpg benchmark. Fortunately the Sentra features three driving modes, including an Eco mode which will help you get every bit of distance out of your gas tank. If you want to see more of the Sentra, be sure to read our review, and watch the video review.