5:Chevrolet Colorado:

Another insider tip to having a fuel efficient car is keeping an eye on your speed control. This may come as news to you but in order for your car to burn an optimum amount of gas which is just enough then you should avoid speeding and the slowing down and then speeding up again because you are causing damage to the engine and your pocket on more gas consumption. According to EPA rating, the optimal speed is around 55 miles per hour and that is why cruise control is an added benefit to a car. In case of the Chevrolet Colorado this is one heck of a power train model equipped with 200 horsepower, 2.5-liter inline4 cylinder engine and EPA ratings of 22/30 city-highway mpg.