Extremely Low mileage. Only 55k miles. Still drive like a new car. Reliable for short and long Trips. Give you all you need. Up to 40 MPG The 2015 Mazda 3i models are powered by a 2.0-liter four-cylinder engine that produces 155 horsepower and 150 pound-feet of torque. It drives the front wheels through either a six-speed manual transmission or an optional six-speed automatic. In Edmunds testing of a Mazda 3i sedan with the automatic transmission, we recorded an 8.3-second 0-60-mph time, which is quicker than average for this class of car. EPA-estimated fuel economy is also excellent. The sedan checks in at 34 mpg combined (30 city/41 highway) with the automatic transmission. The sedan with the manual earns just slightly less at 33 mpg combined (29/41), and you can expect similar numbers for the 3i hatchback. On the 116-mile Edmunds.com evaluation route, the 3i hatchback returned 39.4 mpg.