Mazda CX-9 2WD
What it costs to keep fuelled
$2,000a year, fuel only
The 2021 Mazda CX-9 2WD is EPA-rated at 24 MPG combined (22 city / 28 highway). Over 15,000 miles a year that is about 625 gallons, $2000 a year in fuel, or $0.133 per mile at $3.20/gal.
Across its full 2007–2021 run it averages 20.7 MPG, improving by 6 MPG over 15 model years.
The band is how far one gallon carries it: 24 of the 60 MPG this scale runs to. The square tick is the small sport utility vehicle 2wd average, 34.8.
- Fuel, per year
- $2,000 at 15,000 mi
- Per mile
- $0.133
- Per kilometre
- $0.083
- Gallons burned/yr
- 625
1 mile = 1.609344 km · fuel at $3.20/gal, fixed JUL 2026
Test figure — not a road resultSOURCE·US EPA fuel-economy test data·FUEL ASSUMED AT $3.20/GAL FROM JUL 2026·REVIEWED JUL 2026
How this is worked out
- Start from the EPA combined figure for the model year — a laboratory test cycle run to a fixed procedure, not a road result. Where a year sold several engines or drivetrains, the trims are averaged and the trim count is printed beside the row so you can see how much averaging is behind it.
- Fix a pump price. This site keeps one reference price, $3.20 a US gallon, fixed JUL 2026 and printed next to every dollar figure it produces. It is an assumption with a date on it, not a quote — put your own price in.
- Fix an annual distance. Every annual figure on this site uses 15,000 miles a year, roughly the US average. A cost per year with no stated distance is not a number, it is a mood.
- Divide distance by economy for gallons, multiply by price for the year's fuel, divide price by economy for one mile. The per-kilometre line is that last figure divided by 1.609344 — the same money, in the unit most of the world drives in.
- Stop there. No depreciation, no tyres, no insurance, no servicing. This is the fuel line of the ledger and it is labelled as one; depreciation usually dwarfs everything on it.
gallons/yr = miles/yr ÷ MPG fuel $/yr = gallons/yr × $/gal cost $/mi = $/gal ÷ MPG cost $/km = cost $/mi ÷ 1.609344
The full method, the licence note, and what a test figure cannot tell you →
Re-run the ledger at another pump price
Every line above rests on one pump price. Here is the same entry re-costed at six others, because the price is the part that changes while the test sheet stays put.
| Fuel price | Per mile | 10,000 mi/yr | 15,000 mi/yr | 20,000 mi/yr |
|---|---|---|---|---|
| $2.50/gal | $0.104 | $1042 | $1563 | $2083 |
| $3.00/gal | $0.125 | $1250 | $1875 | $2500 |
| $3.20/gal | $0.133 | $1333 | $2000 | $2667 |
| $3.50/gal | $0.146 | $1458 | $2188 | $2917 |
| $4.00/gal | $0.167 | $1667 | $2500 | $3333 |
| $4.50/gal | $0.188 | $1875 | $2813 | $3750 |
| $5.00/gal | $0.208 | $2083 | $3125 | $4167 |
SOURCE·US EPA fuel-economy test data·FUEL ASSUMED AT $3.20/GAL FROM JUL 2026·REVIEWED JUL 2026
The whole service history, sheet by sheet
15 model years on file. Read down the combined column: a nameplate that got heavier shows it here long before any brochure admits it.
| Year | Combined | City | Highway | EPA fuel cost/yr | CO₂ g/mi | Trims |
|---|---|---|---|---|---|---|
| 2021 | 24 MPG | 22 | 28 | $2600 | 363 | 1 |
| 2020 | 24 MPG | 22 | 28 | $2600 | 363 | 1 |
| 2019 | 24 MPG | 22 | 28 | $2600 | 362 | 1 |
| 2018 | 24 MPG | 22 | 28 | $2600 | 362 | 1 |
| 2017 | 24 MPG | 22 | 28 | $2600 | 362 | 1 |
| 2016 | 24 MPG | 22 | 28 | $2600 | 364 | 1 |
| 2015 | 19 MPG | 17 | 24 | $3300 | 456 | 1 |
| 2014 | 19 MPG | 17 | 24 | $3300 | 456 | 1 |
| 2013 | 19 MPG | 17 | 24 | $3300 | 456 | 1 |
| 2012 | 19 MPG | 17 | 24 | $3300 | 468 | 1 |
| 2011 | 19 MPG | 17 | 24 | $3300 | 468 | 1 |
| 2010 | 18 MPG | 16 | 22 | $3450 | 494 | 1 |
| 2009 | 18 MPG | 16 | 22 | $3450 | 494 | 1 |
| 2008 | 18 MPG | 16 | 22 | $3450 | 494 | 1 |
| 2007 | 18 MPG | 16 | 22 | $3450 | 494 | 1 |
Where a model year offered several engines or drivetrains, the figure is the average across all EPA-tested trims that year — the trim count is shown so you can see how much averaging is involved.
SOURCE·US EPA fuel-economy test data·FUEL ASSUMED AT $3.20/GAL FROM JUL 2026·REVIEWED JUL 2026
Marked against the rest of the small sport utility vehicle 2wd bay
Among the 74 small sport utility vehicle 2wd models tracked here, the Mazda CX-9 2WD ranks 56 on current figures, against a class average of 34.8 MPG — the square tick on the gauge above.
Closest more-efficient alternatives in the same class: Kia Sorento FWD (24.5), Toyota Highlander (24.5), Jeep Cherokee FWD (24.7), Alfa Romeo Stelvio (25), BMW X3 sDrive30i (25).
Tailpipe CO₂ is rated at 363 grams per mile, which works out to roughly 5.4 tonnes a year at 15,000 miles.
Questions asked across the counter
What MPG does the Mazda CX-9 2WD get?
The 2021 Mazda CX-9 2WD is rated at 24 MPG combined by the EPA — 22 city and 28 highway. Across all 15 model years in the database it averages 20.7 MPG, ranging from 18 to 24 depending on year and trim.
How much does a Mazda CX-9 2WD cost in fuel per year?
At 24 MPG and 15,000 miles a year, it burns about 625 gallons — roughly $2000 a year with fuel at $3.20 a gallon, or $0.133 per mile. The EPA's own published annual figure for the 2021 model is $2600.
Has the Mazda CX-9 2WD become more efficient over time?
Yes. It has gone from 18 MPG in 2007 to 24 in 2021 — an improvement of 6 MPG, or 33% across 15 model years.
Is the Mazda CX-9 2WD efficient for its class?
It ranks 56 of 74 in the Small Sport Utility Vehicle 2WD class on current figures, against a class average of 34.8 MPG. That is 10.8 worse than typical for the class.
Pull another logbook off the same shelf
Same class, nearest economy first — the ones a buyer is genuinely choosing between.
SOURCE·US EPA fuel-economy test data·FUEL ASSUMED AT $3.20/GAL FROM JUL 2026·REVIEWED JUL 2026
Cost per mile, per kilometre and per year are computed at a reference price of $3.20 a gallon over 15,000 miles, fixed JUL 2026 — set your own pump price. Estimates based on official test figures and average fuel prices. Real-world consumption varies with driving style, load, terrain and maintenance.
