2018 Mazda 3 4-Door (2L 4-cyl, Manual 6-spd) MPG & Specs
Quick answer
The 2018 Mazda 3 4-Door gets an EPA-estimated 28/38 MPG (city/highway) and 31 MPG combined, with an estimated $2,000/year fuel cost and 281 g/mi CO₂. Engine: 2 L 4-cyl.
The 2018 Mazda 3 4-Door with the 2-liter 4-cylinder regular gasoline engine returns an EPA-estimated 28 MPG in the city and 38 MPG on the highway, for a combined 31 MPG. This page summarizes the official EPA fuel-economy and emissions data for this configuration.
| Engine | 2 L 4-cyl |
| Transmission | Manual 6-spd |
| Drive | Front-Wheel Drive |
| Fuel type | Regular Gasoline |
| Vehicle class | Compact Cars |
| MPG — city | 28 |
| MPG — highway | 38 |
| MPG — combined | 31 |
| Annual fuel cost* | $2,000 |
| CO₂ tailpipe | 281 g/mi |
| EPA GHG score | 7/10 |
How efficient is it?
With a combined 31 MPG, the 2018 Mazda 3 4-Door sits in the good range for fuel economy. That is about 22% better than the typical Compact Cars of its era (25 MPG class average), making it one of the more efficient choices in its class.
Fuel economy and running costs
At about $2,000 per year in fuel (EPA estimate, 15,000 mi/yr), fuel is a major part of the cost of owning the 2018 Mazda 3 4-Door. Over five years that is roughly $10,000 at today's prices — before insurance, maintenance, and depreciation.
Emissions
The 2018 Mazda 3 4-Door emits approximately 281 grams of CO₂ per mile at the tailpipe, earning an EPA greenhouse-gas score of 7 out of 10. Lower emissions generally track higher fuel economy.
How to read these numbers
EPA figures come from standardized laboratory test cycles and are the same estimates shown on the vehicle's window sticker. Your real-world mileage depends on driving style, conditions, fuel grade, and maintenance. Use combined MPG and annual fuel cost to compare vehicles fairly.