19: Kia Niro:

When it comes to being fuel-efficient it is not just a precautionary measure but more of a necessary implication as gas is being consumed too quickly than it had come up from the ground and according to statistics if not careful the remaining sources of oil could be consumed completely in about 40 years. The Kia Niro is another example of a car that gives you more from being eco friendly. It has 136 horsepower and 43 mpg paired up with features like rear cross traffic alert and smart cruise control.