5. Chevrolet Sonic/Chevrolet Cruze 1.4L (1,364 cc)
Both the Chevrolet Sonic, and Chevrolet Cruze are available with turbocharged 1.4-liter engines which are incredibly fuel efficient, making 138-hp and 148-lb-ft of torque. This engine is even standard on the Cruze LT, LTZ and Eco models. The little, but peppy 1,364cc engine helps the Sonic earn 29/40 mpg and 33 mpg combined. In the Cruze Eco, the little engine earns 28/42 mpg and 33 mpg combined. The best part about this turbocharged engine? It doesn’t require premium fuel. The $16,600 Sonic LT Manual and the $18,160 Sonic LTZ both feature the 1.4L engine as a $700 option. The 1.4L engine is also standard on every Chevrolet Cruze, except for the base LS trim.