The Mazda CX-30 does 28 mpg combined (25.1 city, 32.4 highway), which works out to about $1,371 a year in fuel at $3.20 a gallon and 12,000 miles. Against other 4-cyl cars it sits above the average of 25.7 mpg.
Every Mazda CX-30 engine, compared
The Mazda CX-30 was rated in a single specification, so its gas mileage does not vary by version — only by model year. Yearly cost assumes 12,000 miles at $3.20 a gallon.
| Engine | Combined | City / Highway | Years | Fuel per year |
|---|---|---|---|---|
| 2.5L 4-cyl | 25.1 / 32.4 | 2020–2026 | $1,371 |
What that actually costs
The Mazda CX-30 burns a gallon every 28 miles, so 12,000 miles takes about 429 gallons a year. At $3.20 that is what the table below adds up to.
| Measure | Value |
|---|---|
| Cost per mile | $0.114 |
| Fuel per year | $1,371 |
| Fuel over five years | $6,855 |
| Against other 4-cyl cars | −$123 a year |
| EPA's own estimate | $2,221 a year |
City or highway — who is this car for
The Mazda CX-30 gives up 7.3 mpg the moment you leave the motorway — 32.4 out there against 25.1 in town, a 29% drop worth $345 a year. A wide gap punishes stop-and-start traffic; a narrow one means the car doesn't care where you drive it.
| Measure | Value | Reading |
|---|---|---|
| City | 25.1 mpg | $1,530 a year if you only drive in town |
| Highway | 32.4 mpg | $1,185 a year if you mostly commute |
| Gap | +7.3 mpg (29%) | Typical for its type |
How the CX-30 changed over the years
The CX-30 peaked in 2025 at 29 mpg (26 city, 33 highway) and was at its thirstiest in 2022 at 26 — 3 mpg apart, or $153 a year in fuel between buying one year and the other. The 2026 car does 27. Jumps usually mark a new generation or a new engine; dips often mean a heavier body or added all-wheel drive.
| Model year | Combined | City / Highway | Engines offered | Fuel per year |
|---|---|---|---|---|
| 2026 | 24 / 31 | 1 | $1,422 | |
| 2025 | 26 / 33 | 1 | $1,324 | |
| 2024 | 26 / 33 | 1 | $1,324 | |
| 2023 | 26 / 33 | 1 | $1,324 | |
| 2022 | 24 / 31 | 1 | $1,477 | |
| 2021 | 25 / 33 | 1 | $1,371 | |
| 2020 | 25 / 33 | 1 | $1,371 |
MPG is a number. Dollars per year is the answer.
- Fuel profile built from your actual mileage and local prices
- Fuel tracker: what you really spend, month by month
- Insurance and fuel folded into 5-year cost to own
- Compare any two cars on total cost, not sticker price
- No ads, no tracking — and much more
How we count
This page rests on 7 EPA ratings of the Mazda CX-30 — 1 engine across 2020–2026. The mileage is EPA's laboratory figure, unchanged; the yearly bill is ours, at 12,000 miles and $3.20 a gallon, against EPA's own estimate of $2,221. Full method.
Frequently asked questions
What mpg does the Mazda CX-30 get?
28 mpg combined on average — 25.1 in the city and 32.4 on the highway, per EPA ratings across 2020–2026.
How much does a Mazda CX-30 cost in fuel per year?
About $1,371 at 12,000 miles and $3.20 a gallon — roughly $6,855 over five years, or 0.114 dollars a mile.
Which CX-30 engine is the most economical?
The 2.5L 4-cyl at 28 mpg.
Is the CX-30 good on fuel compared with similar cars?
Against other 4-cyl cars it sits above the average of 25.7 mpg, computed across 4765 ratings.
Are these real-world CX-30 figures?
No — they are EPA laboratory ratings, the same ones printed on the window sticker, and EPA's own annual fuel estimate for the Mazda CX-30 is $2,221 against the $1,371 we compute at 12,000 miles. Expect a little worse in practice: the spread between the city and highway figures is smaller than the spread between two drivers of the same one.
Mark ForCar as a preferred source and our data shows up first in your Google results. One click, no account.