2021 Mazda CX-3 Gas Tank Size & Fuel Capacity
Fuel tank capacity
11.9–12.7gal · 45–48 L
The 2021 Mazda CX-3 has a fuel tank capacity of 11.9 to 12.7 gallons (45–48 liters), depending on the trim. The most common size is 12.7 gallons, used on 1 trim.
A full tank is good for roughly 381–432 highway miles or 321–368 miles around town, going by the EPA ratings.
12.7 gal · Smaller than 91% of 2021 models we list.
- By trim
- Gas cap & parts
- Fuel essentials
- Miles per tank
- Fill-up cost
- Other years
- Compared
- Fuel recalls
- Pump & gauge parts
- FAQ
2021 Mazda CX-3 fuel tank capacity by trim
What changes the tank sizeTap an option to filter the table
- Drive
All 2 trims
MPG and range are city / highway.
| Trim | Engine | Drive | Tank | MPG city / hwy | Range city / hwy | |
|---|---|---|---|---|---|---|
| Sport 4dr SUV AWD 2.0L 4cyl 6A · AWD MPG 27 / 32Range 321 / 381 mi | 2.0L 4cyl 6A | AWD | 11.9 gal45 L | 27 / 32 | 321 / 381 mi | |
| Sport 4dr SUV 2.0L 4cyl 6A · FWD MPG 29 / 34Range 368 / 432 mi | 2.0L 4cyl 6A | FWD | 12.7 gal48 L | 29 / 34 | 368 / 432 mi | |
| No trim matches all of these filters. | ||||||
Tank figures are the manufacturer's rated capacity, sorted smallest tank first. Range is tank size times EPA city or highway MPG.
How far a 2021 Mazda CX-3 goes on a tank
Gallons left and the distance they cover at each mark on the fuel gauge, at EPA city and highway mileage. At the combined rating of 31 MPG, a full 12.7-gallon tank covers about 394 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 12.7 | 432 | 368 |
| 3/4 | 9.5 | 324 | 276 |
| 1/2 | 6.4 | 216 | 184 |
| 1/4 | 3.2 | 108 | 92 |
| 1/8 | 1.6 | 54 | 46 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 484 gallons, roughly 38 full tanks.
Fuel gauges aren't perfectly linear and the low-fuel light comes on with a few gallons still in the tank, so plan your stop before the last eighth.
- EPA combined
- 29–31 MPG
- Tailpipe CO2
- 289–303 g/mi
- EPA greenhouse score
- 6–7 of 10
- Source
- EPA ratings
What it costs to fill up a 2021 Mazda CX-3
$54.23 to fill the 12.7-gallon tank from empty with regular, at this week's US average of $4.27 a gallon.
| Tank | Fuel | US avg / gal | From empty | From 1/4 tank |
|---|---|---|---|---|
| 11.9 gal | Regular | $4.27 | $50.81 | $38.11 |
| 12.7 gal | Regular | $4.27 | $54.23 | $40.67 |
By region, 12.7-gallon tank
| Region | Regular / gal | Fill from empty |
|---|---|---|
| East Coast | $4.02 | $51.05 |
| Midwest | $4.27 | $54.23 |
| Gulf CoastLowest | $3.70 | $46.99 |
| Rocky Mountain | $4.46 | $56.64 |
| West Coast | $5.42 | $68.83 |
| CaliforniaHighest | $5.89 | $74.80 |
Prices: U.S. Energy Information Administration retail averages for the week of October 26, 2026. This week's prices by state and city.
Your own price
- 11.9-gallon tank$50.81
- 12.7-gallon tank$54.23
- A year of driving (15,000 mi)$2,066
Starts at the US average for regular; type in what your station charges. For other tank sizes, use the fill-up calculator.
CX-3 tank size in other years
The 2021 CX-3 uses the same 11.9–12.7 gal tank sizes as every CX-3 since 2016.
| Model year | Tank | Longest highway range |
|---|---|---|
| 2021 CX-3 | 11.9–12.7 gal | 432 mi |
| 2020 CX-3 | 11.9–12.7 gal | 432 mi |
| 2019 CX-3 | 11.9–12.7 gal | 432 mi |
| 2018 CX-3 | 11.9–12.7 gal | 432 mi |
| 2017 CX-3 | 11.9–12.7 gal | 432 mi |
| 2016 CX-3 | 11.9–12.7 gal | 445 mi |
2021 Mazda CX-3 vs similar 2021 SUVs
At 12.7 gallons, the CX-3's largest tank ranks sixth of the seven 2021 SUVs compared here. The Buick Encore carries the most (14.0 gal) and the Jeep Renegade the least (12.7 gal).
| 2021 model | Tank | Longest highway range |
|---|---|---|
| Buick Encore | 14.0 gal | 420 mi |
| Chevrolet Trax | 14.0 gal | 434 mi |
| Honda HR-V | 13.2 gal | 449 mi |
| Kia Seltos | 13.2 gal | 449 mi |
| Hyundai Kona | 13.2 gal | 436 mi |
| Mazda CX-3 | 11.9–12.7 gal | 432 mi |
| Jeep Renegade | 12.7 gal | 381 mi |
Other 2021 SUVs of a similar size, one model per brand.
2021 Mazda CX-3 fuel system recalls
None of the 1 recall NHTSA lists for the 2021 Mazda CX-3 involve the fuel system.
2021 Mazda CX-3 fuel pump and gauge parts
NHTSA lists no fuel-system recall for the 2021 Mazda CX-3, so a failed pump or gauge is a normal repair. These are the part numbers the makers list for it.
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Frequently asked questions
What is the fuel tank capacity of the 2021 Mazda CX-3?
The 2021 Mazda CX-3 holds between 11.9 and 12.7 gallons, depending on the trim. 12.7 gallons is the usual size; the smaller 11.9-gallon tank is on the Sport 4dr SUV AWD.
How many gallons and liters does the 2021 Mazda CX-3 gas tank hold?
The 2021 Mazda CX-3 tank holds 45–48 liters, or 11.9–12.7 gallons in US gallons.
Which 2021 Mazda CX-3 has the biggest gas tank?
The 12.7-gallon tank is on the Sport 4dr SUV. The smallest tank, 11.9 gallons, is on the Sport 4dr SUV AWD.
Does AWD change the 2021 Mazda CX-3 gas tank?
Yes. AWD: 11.9 gal; FWD: 12.7 gal.
How far can a 2021 Mazda CX-3 go on a full tank?
About 381–432 miles on the highway and 321–368 miles in town, going from full to empty at its EPA ratings. Expect less in practice, since nobody runs the tank dry.
How many miles can a 2021 Mazda CX-3 go on a quarter tank?
About 108 highway miles or 92 in town from the 12.7-gallon tank, which has roughly 3.2 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 2021 Mazda CX-3 take?
Regular unleaded. The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 2021 Mazda CX-3?
At the US average of $4.27 a gallon for regular (EIA, week of October 26, 2026), filling the 12.7-gallon tank from empty costs $54.23. It ranges from $46.99 in the Gulf Coast to $74.80 in California.
How much does a full tank of gas weigh in a 2021 Mazda CX-3?
About 79 pounds for the 12.7-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 2021 Mazda CX-3 have a bigger gas tank than the Honda HR-V?
No. The 2021 Honda HR-V holds up to 13.2 gallons; the 2021 Mazda CX-3 holds up to 12.7.
Has the 2021 Mazda CX-3 had a fuel pump or fuel system recall?
No. None of the 1 recall NHTSA lists for the 2021 Mazda CX-3 involve the fuel system.
Sources
- Tank sizes: manufacturer-rated capacities from US-market specifications, checked against independent references. Updated October 2026.
- MPG and range: EPA ratings (fueleconomy.gov). Range is tank size times EPA MPG.
- Fuel prices: U.S. Energy Information Administration, week of October 26, 2026 (this week's prices).
- Recalls: NHTSA recall database (Mazda fuel system recalls).
Does your owner's manual say something different? Let us know and we'll fix it. More on how we check the numbers.