Fuel Economy of the 2016 Mazda 3 5-Door. Compare the gas mileage and greenhouse gas emissions of the 2016 Mazda 3 5-Door side-by-side with other cars and trucks Fuel economy of the 2019 Mazda 3. 1984 to present Buyer's Guide to Fuel Efficient Cars and Trucks. Estimates of gas mileage, greenhouse gas emissions, safety ratings, and air pollution ratings for new and used cars and trucks. Fuel Economy of 2016 Mazda Vehicles. EPA MPG Owner MPG Estimates 2016 2016 Mazda 6 4 cyl, 2.5 L, Automatic (S6) Regular Gasoline: Not Available. Fuel Economy. 8.0 /10. How’s the fuel economy? I previously owned a white 2016 Mazda 6 Touring. Due to an driver's fail to yield, my car was totalled back in late November. I checked out a 2016 Mazda 3 4-Door. Personalize. Add a Vehicle. 2.0 L, 4 cyl, Automatic (S6) MSRP: $18,895 - $25,795. 2016 Mazda 3 4-Door. EPA Fuel Economy. 2016 Mazda 6 MPG. Based on data from 253 vehicles, 22,939 fuel-ups and 7,840,507 miles of driving, the 2016 Mazda 6 gets a combined Avg MPG of 29.68 with a 0.07 MPG margin of error. Below you can see a distribution of the fuel-ups with 564 outliers (2.40%) removed. city/highway. MPG. City MPG: 26. city. Highway MPG: 37. highway. 3.3 gals/ 100 miles. 2016 Mazda 6 If a driver uses the fuel economy meter as the basis for budgeting, he would plan for five-year fuel costs of $12,000 (assuming fuel stays at $4 per gallon). In reality, the figure would be $12,660. Highway MPG: 25. highway. 5.0 gals/100 miles. Unofficial MPG Estimates Shared by Vehicle Owners. View Estimates. It's still a great choice if you're looking for a full-size truck. Most fuel-efficient 2WD variant (3.0-liter turbodiesel V6): 23 mpg combined, 20 city/28 highway. Most fuel-efficient 4WD variant B5Gd.