7 . Fiat 500: 1.4L (1,368 cc)

Fiat‘s spunky 500 has another tiny engine, the 1.4-liter MultiAir which makes 101-hp and 98-lb-ft of torque. This 1,368cc engine helps the little Italian coupe earn 30/38 mpg , with a combined rating of 33 mpg.  However, the Fiat 500 engine prefers to use premium fuel, which does cut into the cost savings with a smaller’ engine discussion. The same engine is used, but with a turbocharger in the Fiat 500 Abarth as well, which makes 160-hp. The Fiat 500 comes in at $15,500, while the more powerful 500 Abarth costs $22,000.