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2017 Mazda CX-3 GS
Shown: 2017 Mazda CX-3 GS. Photo: Elise240SX, CC BY-SA 4.0, via Wikimedia Commons
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  • MY2016–2021

Mazda CX-3 MPG & Fuel Cost by Year

6 model years · 2016–2021

31 MPG
Combined
29 MPG
City
34 MPG
Highway
Annual cost · MY2021 CX-3 2.0L 4-cyl FWD
$2,130

15,000 mi/yr · regular gasoline $4.36/gal (U.S. average, Sep 2026)

All Mazda models

Mazda CX-3 fuel economy at a glance

EPA has rated the Mazda CX-3 for 6 model years, 2016 to 2021. Across those years its combined rating runs 29–31 MPG. The latest model year, 2021, has 2 configurations rated 29–31 MPG combined and costing $2,130–$2,240 a year to fuel at regular gasoline $4.36/gal (U.S. average, Sep 2026). The most efficient configuration on record since 2016 is the 2021 CX-3 2.0L 4-cyl FWD, at 31 MPG.

Mazda CX-3 MPG by year

283032 20162021 Gas 283032 20162021 Gas
Combined MPG: the line is the most efficient configuration, the shaded band reaches down to the least efficient. Dotted lines mark new generations.
Mazda CX-3: combined fuel economy and annual fuel cost for each model year, grouped by generation
Year Gas (MPG) $/yr
2016-2021 Generation page
2021 29–31 $2,130–$2,240
2020 29–31 $2,130–$2,240
2019 29–31 $2,130–$2,240
2018 29–31 $2,100–$2,280
2017 29–31 $2,100–$2,280
2016 29–31 $2,110–$2,280

Costs use the current EIA price set and 15,000 miles a year for every year, so years are comparable. Green marks the best year for each powertrain.

Mazda CX-3 generations

1 generations between 2016 and 2021. Open one for the table of every model year and configuration.

2017 Mazda CX-3 GS

2016-2021 Mazda CX-3

29–31 MPG · $2,100–$2,280/yr

2021 powertrain options

Gas · 2.0L
Combined
29–31 MPG
Per year
$2,130–$2,240
See gas configurations
EPA ratings: fueleconomy.gov file of Sep 29, 2026 · regular gasoline $4.36/gal (U.S. average, Sep 2026) · 15,000 mi/yr, 55% city / 45% highway · How we calculate

Frequently asked questions

What is the Mazda CX-3's gas mileage by year?

EPA combined ratings for the Mazda CX-3 run 29–31 MPG across model years 2016 to 2021. The latest year, 2021, is rated 29–31 MPG.

Which Mazda CX-3 model year has the best gas mileage?

The 2021 Mazda CX-3 CX-3 2.0L 4-cyl FWD has the highest combined rating since 2016, at 31 MPG.

How much does a Mazda CX-3 cost to fuel per year?

For MY2021, EPA-rated configurations cost $2,130–$2,240 a year to fuel, driving 15,000 miles at regular gasoline $4.36/gal (U.S. average, Sep 2026). The most efficient one costs $2,130.

Has the Mazda CX-3's fuel economy improved over time?

Not much. The most efficient configuration is rated 31 MPG in both 2016 and 2021.

Which Mazda CX-3 model years have the same ratings?

EPA lists identical ratings as the previous year for 2020. The generation pages mark those years "same EPA ratings" and point to the year that holds the full table.