Best Gas Mileage Cars: Honda CR-Z or Hyundai Sonata Hybrid: Ranking in fifth place is a duel between the H companies; CR-Z and the Sonata Hybrid each has a estimated combined 37 mpg. Honda offers a sporty coupe at a comfortable price range while Hyundai offers a full sedan with great gas mileage.    Honda CR-Z: 35 City/39 Hwy (37 Combined), Base price: $19,345. 1.5-liter, 4-Cylinder engine with 122 hp. 0-60 mph in 9.7 secs.