2021 Mazda CX-3 2WD MPG & Specs — Real Fuel Cost
Quick answer
The 2021 Mazda CX-3 2WD gets an EPA-estimated 29/34 MPG (city/highway) and 31 MPG combined, with an estimated $2,000/year fuel cost and 289 g/mi CO₂. Engine: 2 L 4-cyl.
The 2021 Mazda CX-3 2WD with the 2-liter 4-cylinder regular gasoline engine returns an EPA-estimated 29 MPG in the city and 34 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 | Automatic (S6) |
| Drive | Front-Wheel Drive |
| Fuel type | Regular Gasoline |
| Vehicle class | Compact Cars |
| MPG — city | 29 |
| MPG — highway | 34 |
| MPG — combined | 31 |
| Annual fuel cost* | $2,000 |
| CO₂ tailpipe | 289 g/mi |
| EPA GHG score | 7/10 |
How efficient is it?
With a combined 31 MPG, the 2021 Mazda CX-3 2WD 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 2021 Mazda CX-3 2WD. Over five years that is roughly $10,000 at today's prices — before insurance, maintenance, and depreciation.
Emissions
The 2021 Mazda CX-3 2WD emits approximately 289 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.