2021 Cadillac XT4 Gas Tank Size & Fuel Capacity
Fuel tank capacity
15.9–16.3gal · 60–62 L
The 2021 Cadillac XT4 has a fuel tank capacity of 15.9 to 16.3 gallons (60–62 liters), depending on the trim. The most common size is 16.3 gallons, used on 3 trims.
A full tank is good for roughly 473–477 highway miles or 359–382 miles around town, going by the EPA ratings.
16.3 gal · Smaller than 61% of 2021 models we list.
- By trim
- Gas cap & parts
- Fuel essentials
- Miles per tank
- Fill-up cost
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- Compared
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- FAQ
2021 Cadillac XT4 fuel tank capacity by trim
What changes the tank sizeTap an option to filter the table
- Drive
All 6 trims
MPG and range are city / highway.
| Trim | Engine | Drive | Tank | MPG city / hwy | Range city / hwy | |
|---|---|---|---|---|---|---|
| Luxury 4dr SUV 2.0L 4cyl Turbo 9A · FWD MPG 24 / 30Range 382 / 477 mi | 2.0L 4cyl Turbo 9A | FWD | 15.9 gal60 L | 24 / 30 | 382 / 477 mi | |
| Premium Luxury 4dr SUV 2.0L 4cyl Turbo 9A · FWD MPG 24 / 30Range 382 / 477 mi | 2.0L 4cyl Turbo 9A | FWD | 15.9 gal60 L | 24 / 30 | 382 / 477 mi | |
| Sport 4dr SUV 2.0L 4cyl Turbo 9A · FWD MPG 24 / 30Range 382 / 477 mi | 2.0L 4cyl Turbo 9A | FWD | 15.9 gal60 L | 24 / 30 | 382 / 477 mi | |
| Luxury 4dr SUV AWD 2.0L 4cyl Turbo 9A · AWD MPG 22 / 29Range 359 / 473 mi | 2.0L 4cyl Turbo 9A | AWD | 16.3 gal62 L | 22 / 29 | 359 / 473 mi | |
| Premium Luxury 4dr SUV AWD 2.0L 4cyl Turbo 9A · AWD MPG 22 / 29Range 359 / 473 mi | 2.0L 4cyl Turbo 9A | AWD | 16.3 gal62 L | 22 / 29 | 359 / 473 mi | |
| Sport 4dr SUV AWD 2.0L 4cyl Turbo 9A · AWD MPG 22 / 29Range 359 / 473 mi | 2.0L 4cyl Turbo 9A | AWD | 16.3 gal62 L | 22 / 29 | 359 / 473 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 Cadillac XT4 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 24 MPG, a full 16.3-gallon tank covers about 391 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 16.3 | 473 | 359 |
| 3/4 | 12.2 | 355 | 269 |
| 1/2 | 8.2 | 236 | 179 |
| 1/4 | 4.1 | 118 | 90 |
| 1/8 | 2.0 | 59 | 45 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 625 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
- 24–26 MPG
- Tailpipe CO2
- 336–369 g/mi
- EPA greenhouse score
- 5 of 10
- Source
- EPA ratings
What it costs to fill up a 2021 Cadillac XT4
$86.06 to fill the 16.3-gallon tank from empty with premium, at this week's US average of $5.28 a gallon.
| Tank | Fuel | US avg / gal | From empty | From 1/4 tank |
|---|---|---|---|---|
| 15.9 gal | Premium | $5.28 | $83.95 | $62.96 |
| 16.3 gal | Premium | $5.28 | $86.06 | $64.55 |
By region, 16.3-gallon tank
| Region | Premium / gal | Fill from empty |
|---|---|---|
| East Coast | $4.93 | $80.36 |
| Midwest | $5.37 | $87.53 |
| Gulf CoastLowest | $4.57 | $74.49 |
| Rocky Mountain | $5.12 | $83.46 |
| West Coast | $6.08 | $99.10 |
| CaliforniaHighest | $6.36 | $103.67 |
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
- 15.9-gallon tank$83.95
- 16.3-gallon tank$86.06
- A year of driving (15,000 mi)$3,300
Starts at the US average for premium; type in what your station charges. For other tank sizes, use the fill-up calculator.
XT4 tank size in other years
The 2021 XT4 uses the same 15.9–16.3 gal tank sizes as every XT4 since 2019.
| Model year | Tank | Longest highway range |
|---|---|---|
| 2025 XT4 | 15.9–16.3 gal | 461 mi |
| 2024 XT4 | 15.9–16.3 gal | 461 mi |
| 2023 XT4 | 15.9–16.3 gal | 477 mi |
| 2022 XT4 | 15.9–16.3 gal | 477 mi |
| 2021 XT4 | 15.9–16.3 gal | 477 mi |
| 2020 XT4 | 15.9–16.3 gal | 477 mi |
| 2019 XT4 | 15.9–16.3 gal | 477 mi |
2021 Cadillac XT4 vs similar 2021 SUVs
At 16.3 gallons, the XT4's largest tank ranks fourth of the seven 2021 SUVs compared here. The Land Rover Discovery Sport carries the most (17.7 gal) and the Lexus NX 300 the least (15.9 gal).
| 2021 model | Tank | Longest highway range |
|---|---|---|
| Land Rover Discovery Sport | 17.7 gal | 407 mi |
| Jaguar E-PACE | 17.7 gal | 460 mi |
| Alfa Romeo Stelvio | 16.9 gal | 490 mi |
| Cadillac XT4 | 15.9–16.3 gal | 477 mi |
| Lincoln Corsair | 11.2–16.2 gal | 470 mi |
| Audi Q3 | 15.9 gal | 477 mi |
| Lexus NX 300 | 15.9 gal | 445 mi |
Other 2021 SUVs of a similar size, one model per brand.
2021 Cadillac XT4 fuel system recalls
None of the 1 recall NHTSA lists for the 2021 Cadillac XT4 involve the fuel system.
Frequently asked questions
What is the fuel tank capacity of the 2021 Cadillac XT4?
The 2021 Cadillac XT4 holds between 15.9 and 16.3 gallons, depending on the trim. 16.3 gallons is the usual size; the smaller 15.9-gallon tank is on the Luxury 4dr SUV.
How many gallons and liters does the 2021 Cadillac XT4 gas tank hold?
The 2021 Cadillac XT4 tank holds 60–62 liters, or 15.9–16.3 gallons in US gallons.
Which 2021 Cadillac XT4 has the biggest gas tank?
The 16.3-gallon tank is on the Luxury 4dr SUV AWD, Premium Luxury 4dr SUV AWD, Sport 4dr SUV AWD. The smallest tank, 15.9 gallons, is on the Luxury 4dr SUV.
Does AWD change the 2021 Cadillac XT4 gas tank?
Yes. FWD: 15.9 gal; AWD: 16.3 gal.
How far can a 2021 Cadillac XT4 go on a full tank?
About 473–477 miles on the highway and 359–382 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 Cadillac XT4 go on a quarter tank?
About 118 highway miles or 90 in town from the 16.3-gallon tank, which has roughly 4.1 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 2021 Cadillac XT4 take?
Premium unleaded (recommended). The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 2021 Cadillac XT4?
At the US average of $5.28 a gallon for premium (EIA, week of October 26, 2026), filling the 16.3-gallon tank from empty costs $86.06. It ranges from $74.49 in the Gulf Coast to $103.67 in California.
How much does a full tank of gas weigh in a 2021 Cadillac XT4?
About 101 pounds for the 16.3-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 2021 Cadillac XT4 have a bigger gas tank than the Lincoln Corsair?
Yes. The 2021 Cadillac XT4 holds up to 16.3 gallons; the 2021 Lincoln Corsair holds up to 16.2.
Has the 2021 Cadillac XT4 had a fuel pump or fuel system recall?
No. None of the 1 recall NHTSA lists for the 2021 Cadillac XT4 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 (Cadillac 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.