6:Chrysler Pacifica:

Aerodynamics is another tool that comes in handy when dealing with fuel-efficient cars. The design has to be crafted in such a way that it allows air to whip through and the car can get past it smoothly. Usually hybrid cars are more aerodynamically sufficient. In case of the Chrysler Pacifica it is not only fuel-efficient but has the stars for having great space too. It is a plug in hybrid model and runs on 30 mpg paired with 3.6 liter V6 gas engine. A lot can be said about this car but in terms of fuel-efficiency it definitely takes a good place.