The 500X rides firmer, while the Trax feels less stable on the road. Fuel economy for the 2.4-liter with front-wheel drive is 22/31/25 mpg city/highway/combined. All-wheel drive (AWD) drops those See all data. With the turbocharged 160hp 1.4L I4 engine, 6-speed automated manual transmission, and front-wheel drive, the 2014 Fiat 500L has been averaging 23.34 MPG (miles per gallon). The 2014 Fiat 500Ls in this analysis were driven mostly in the city (about 60.2 percent of the miles driven). The rest of the miles were in heavy traffic (30. Be nice, and you'll manage 28/34 miles per gallon (city/highway). Fiat claims that the 500 Abarth will sprint to 60 miles per hour in 7.2 seconds, 0.6 seconds behind a Cooper S. Keep in mind, the Most DEF tanks require one gallon of DEF for every 50 gallons of diesel fuel, and one gallon will generally last between 300 to 500 miles. It is important not to allow the DEF tote to become completely empty. It should be refilled when 2-3 inches of DEF remains in the tote. This calculator will give you a solid estimate of what gas will cost you annually. Simply find your car’s make and model from one of the two pull-down menus, and then enter the pertinent information regarding your car’s MPG rating, the approximate number of miles you plan to drive for the year, and the price per gallon of gas. Press The most accurate 2015 Fiat 500s MPG estimates based on real world 9,434 fuel-ups and 2,369,578 miles of driving, the 2015 Fiat 500 gets a combined Avg MPG of 29. 2016 Fiat 500 X AWD EPA Fuel Economy Regular Gasoline Combined MPG: 24: MPG City MPG: 21: Highway MPG: 29: combined city/highway 364 grams per mile: EPA Smog Rating ; Bad gas mileage. My 2012 Fiat 500 Lounge gets lousy gas mileage: 19-21 mpg in the city; 26-28 mpg on the freeway (coincidentally, that's the identical mileage that my last new car got -- a 190 hp V6 Passat wagon . . .) The mileage has been exactly the same since the car was brand new - no changes. It now has about 6,000 miles on it. 4raAFD.