2021 GMC Terrain Gas Tank Size & Fuel Capacity
Fuel tank capacity
14.9–15.6gal · 56–59 L
The 2021 GMC Terrain has a fuel tank capacity of 14.9 to 15.6 gallons (56–59 liters), depending on the trim. The most common size is 14.9 gallons, used on 4 trims.
A full tank is good for roughly 437–447 highway miles or 387–390 miles around town, going by the EPA ratings.
15.6 gal · Smaller than 73% 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 GMC Terrain fuel tank capacity by trim
What changes the tank sizeTap an option to filter the table
- Drive
All 7 trims
MPG and range are city / highway.
| Trim | Engine | Drive | Tank | MPG city / hwy | Range city / hwy | |
|---|---|---|---|---|---|---|
| Denali 4dr SUV 1.5L 4cyl Turbo 9A · FWD MPG 26 / 30Range 387 / 447 mi | 1.5L 4cyl Turbo 9A | FWD | 14.9 gal56 L | 26 / 30 | 387 / 447 mi | |
| SL 4dr SUV 1.5L 4cyl Turbo 9A · FWD MPG 26 / 30Range 387 / 447 mi | 1.5L 4cyl Turbo 9A | FWD | 14.9 gal56 L | 26 / 30 | 387 / 447 mi | |
| SLE 4dr SUV 1.5L 4cyl Turbo 9A · FWD MPG 26 / 30Range 387 / 447 mi | 1.5L 4cyl Turbo 9A | FWD | 14.9 gal56 L | 26 / 30 | 387 / 447 mi | |
| SLT 4dr SUV 1.5L 4cyl Turbo 9A · FWD MPG 26 / 30Range 387 / 447 mi | 1.5L 4cyl Turbo 9A | FWD | 14.9 gal56 L | 26 / 30 | 387 / 447 mi | |
| Denali 4dr SUV AWD 1.5L 4cyl Turbo 9A · AWD MPG 25 / 28Range 390 / 437 mi | 1.5L 4cyl Turbo 9A | AWD | 15.6 gal59 L | 25 / 28 | 390 / 437 mi | |
| SLE 4dr SUV AWD 1.5L 4cyl Turbo 9A · AWD MPG 25 / 28Range 390 / 437 mi | 1.5L 4cyl Turbo 9A | AWD | 15.6 gal59 L | 25 / 28 | 390 / 437 mi | |
| SLT 4dr SUV AWD 1.5L 4cyl Turbo 9A · AWD MPG 25 / 28Range 390 / 437 mi | 1.5L 4cyl Turbo 9A | AWD | 15.6 gal59 L | 25 / 28 | 390 / 437 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 GMC Terrain 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 28 MPG, a full 14.9-gallon tank covers about 417 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 14.9 | 447 | 387 |
| 3/4 | 11.2 | 335 | 291 |
| 1/2 | 7.5 | 224 | 194 |
| 1/4 | 3.7 | 112 | 97 |
| 1/8 | 1.9 | 56 | 48 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 536 gallons, roughly 36 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
- 26 MPG
- Tailpipe CO2
- 342 g/mi
- EPA greenhouse score
- 5 of 10
- Source
- EPA ratings
What it costs to fill up a 2021 GMC Terrain
$63.62 to fill the 14.9-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 |
|---|---|---|---|---|
| 14.9 gal | Regular | $4.27 | $63.62 | $47.72 |
| 15.6 gal | Regular | $4.27 | $66.61 | $49.96 |
By region, 14.9-gallon tank
| Region | Regular / gal | Fill from empty |
|---|---|---|
| East Coast | $4.02 | $59.90 |
| Midwest | $4.27 | $63.62 |
| Gulf CoastLowest | $3.70 | $55.13 |
| Rocky Mountain | $4.46 | $66.45 |
| West Coast | $5.42 | $80.76 |
| CaliforniaHighest | $5.89 | $87.76 |
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
- 14.9-gallon tank$63.62
- 15.6-gallon tank$66.61
- A year of driving (15,000 mi)$2,287
Starts at the US average for regular; type in what your station charges. For other tank sizes, use the fill-up calculator.
Terrain tank size in other years
The 2021 Terrain uses the same 14.9–15.6 gal tank sizes as every Terrain since 2018.
| Model year | Tank | Longest highway range |
|---|---|---|
| 2026 Terrain | 14.8–15.6 gal | 437 mi |
| 2025 Terrain | 14.8–15.6 gal | 437 mi |
| 2024 Terrain | 14.9–15.6 gal | 437 mi |
| 2023 Terrain | 14.9–15.6 gal | 437 mi |
| 2022 Terrain | 14.9–15.6 gal | 447 mi |
| 2021 Terrain | 14.9–15.6 gal | 447 mi |
| 2020 Terrain | 14.9–15.6 gal | 447 mi |
| 2019 Terrain | 14.9–15.6 gal | 593 mi |
| 2018 Terrain | 14.9–15.6 gal | 593 mi |
| 2017 Terrain | 18.8 gal | 583 mi |
| 2016 Terrain | 18.8 gal | 602 mi |
2021 GMC Terrain vs similar 2021 SUVs
At 15.6 gallons, the Terrain's largest tank ranks fourth of the seven 2021 SUVs compared here. The Subaru Forester carries the most (16.6 gal) and the Honda CR-V the least (14.0 gal).
| 2021 model | Tank | Longest highway range |
|---|---|---|
| Subaru Forester | 16.6 gal | 548 mi |
| Hyundai Tucson | 16.4 gal | 459 mi |
| Ford Escape | 14.3–15.7 gal | 529 mi |
| GMC Terrain | 14.9–15.6 gal | 447 mi |
| Toyota RAV4 | 14.5 gal | 508 mi |
| Nissan Rogue | 14.5 gal | 508 mi |
| Honda CR-V | 14.0 gal | 476 mi |
Other 2021 SUVs of a similar size, one model per brand.
2021 GMC Terrain fuel system recalls
None of the 2 recalls NHTSA lists for the 2021 GMC Terrain involve the fuel system.
2021 GMC Terrain fuel pump and gauge parts
NHTSA lists no fuel-system recall for the 2021 GMC Terrain, 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 GMC Terrain?
The 2021 GMC Terrain holds between 14.9 and 15.6 gallons, depending on the trim. 14.9 gallons is the usual size; the 15.6-gallon tank comes on the Denali 4dr SUV AWD (1.5L 4cyl Turbo 9A).
How many gallons and liters does the 2021 GMC Terrain gas tank hold?
The 2021 GMC Terrain tank holds 56–59 liters, or 14.9–15.6 gallons in US gallons.
Which 2021 GMC Terrain has the biggest gas tank?
The 15.6-gallon tank is on the Denali 4dr SUV AWD, SLE 4dr SUV AWD, SLT 4dr SUV AWD. The smallest tank, 14.9 gallons, is on the Denali 4dr SUV.
Does AWD change the 2021 GMC Terrain gas tank?
Yes. FWD: 14.9 gal; AWD: 15.6 gal.
How far can a 2021 GMC Terrain go on a full tank?
About 437–447 miles on the highway and 387–390 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 GMC Terrain go on a quarter tank?
About 112 highway miles or 97 in town from the 14.9-gallon tank, which has roughly 3.7 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 2021 GMC Terrain take?
Regular unleaded. The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 2021 GMC Terrain?
At the US average of $4.27 a gallon for regular (EIA, week of October 26, 2026), filling the 14.9-gallon tank from empty costs $63.62. It ranges from $55.13 in the Gulf Coast to $87.76 in California.
How much does a full tank of gas weigh in a 2021 GMC Terrain?
About 97 pounds for the 15.6-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 2021 GMC Terrain have a bigger gas tank than the Toyota RAV4?
Yes. The 2021 GMC Terrain holds up to 15.6 gallons; the 2021 Toyota RAV4 holds up to 14.5.
Has the 2021 GMC Terrain had a fuel pump or fuel system recall?
No. None of the 2 recalls NHTSA lists for the 2021 GMC Terrain 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 (GMC 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.