2021 Cadillac CT5 Gas Tank Size & Fuel Capacity
Fuel tank capacity
17.0gal · 64 L
The 2021 Cadillac CT5 has a fuel tank capacity of 17.0 gallons (64 liters) on every trim.
A full tank is good for roughly 459–544 highway miles or 306–391 miles around town, going by the EPA ratings.
17.0 gal · Smaller than 58% 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 Cadillac CT5 fuel tank capacity by trim
What changes the tank sizeTap an option to filter the table
- Engine
- no difference
All 4 trims
MPG and range are city / highway.
| Trim | Engine | Drive | Tank | Fuel | MPG city / hwy | Range city / hwy |
|---|---|---|---|---|---|---|
| Luxury 4dr Sedan 2.0L 4cyl Turbo 10A · RWD · Premium (recommended) MPG 23 / 32Range 391 / 544 mi | 2.0L 4cyl Turbo 10A | RWD | 17.0 gal64 L | Premiumrecommended | 23 / 32 | 391 / 544 mi |
| Premium Luxury 4dr Sedan 2.0L 4cyl Turbo 10A · RWD · Premium (recommended) MPG 23 / 32Range 391 / 544 mi | 2.0L 4cyl Turbo 10A | RWD | 17.0 gal64 L | Premiumrecommended | 23 / 32 | 391 / 544 mi |
| Sport 4dr Sedan 2.0L 4cyl Turbo 10A · RWD · Premium (recommended) MPG 23 / 32Range 391 / 544 mi | 2.0L 4cyl Turbo 10A | RWD | 17.0 gal64 L | Premiumrecommended | 23 / 32 | 391 / 544 mi |
| V 4dr Sedan 3.0L 6cyl Turbo 10A · RWD · Premium (required) MPG 18 / 27Range 306 / 459 mi | 3.0L 6cyl Turbo 10A | RWD | 17.0 gal64 L | Premiumrequired | 18 / 27 | 306 / 459 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 CT5 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 26 MPG, a full 17.0-gallon tank covers about 442 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 17.0 | 544 | 391 |
| 3/4 | 12.8 | 408 | 293 |
| 1/2 | 8.5 | 272 | 196 |
| 1/4 | 4.3 | 136 | 98 |
| 1/8 | 2.1 | 68 | 49 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 577 gallons, roughly 34 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
- 21–26 MPG
- Tailpipe CO2
- 337–423 g/mi
- EPA greenhouse score
- 4–5 of 10
- Source
- EPA ratings
What it costs to fill up a 2021 Cadillac CT5
$89.76 to fill the 17.0-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 |
|---|---|---|---|---|
| 17.0 gal | Premium | $5.28 | $89.76 | $67.32 |
By region, 17.0-gallon tank
| Region | Premium / gal | Fill from empty |
|---|---|---|
| East Coast | $4.93 | $83.81 |
| Midwest | $5.37 | $91.29 |
| Gulf CoastLowest | $4.57 | $77.69 |
| Rocky Mountain | $5.12 | $87.04 |
| West Coast | $6.08 | $103.36 |
| CaliforniaHighest | $6.36 | $108.12 |
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
- 17.0-gallon tank$89.76
- A year of driving (15,000 mi)$3,046
Starts at the US average for premium; type in what your station charges. For other tank sizes, use the fill-up calculator.
CT5 tank size in other years
The 2021 CT5 uses the same 17.0 gal tank as the 2020 model.
| Model year | Tank | Longest highway range |
|---|---|---|
| 2026 CT5 | 17.0 gal | 527 mi |
| 2025 CT5 | 17.0 gal | 544 mi |
| 2024 CT5 | 17.0 gal | 561 mi |
| 2023 CT5 | 17.0 gal | 561 mi |
| 2022 CT5 | 17.0 gal | 561 mi |
| 2021 CT5 | 17.0 gal | 544 mi |
| 2020 CT5 | 17.0 gal | 544 mi |
2021 Cadillac CT5 vs similar 2021 sedans
At 17.0 gallons, the CT5's largest tank ranks third of the five 2021 sedans compared here. The INFINITI Q50 carries the most (20.0 gal) and the Audi A4 the least (15.3 gal).
| 2021 model | Tank | Longest highway range |
|---|---|---|
| INFINITI Q50 | 20.0 gal | 580 mi |
| Jaguar XF | 19.5 gal | 644 mi |
| Cadillac CT5 | 17.0 gal | 544 mi |
| Lexus ES 350 | 15.9 gal | 509 mi |
| Audi A4 | 15.3 gal | 520 mi |
Other 2021 sedans of a similar size, one model per brand.
2021 Cadillac CT5 fuel system recalls
None of the 4 recalls NHTSA lists for the 2021 Cadillac CT5 involve the fuel system.
2021 Cadillac CT5 fuel pump and gauge parts
NHTSA lists no fuel-system recall for the 2021 Cadillac CT5, 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 Cadillac CT5?
The 2021 Cadillac CT5 holds 17.0 gallons (64 liters) on every trim we list.
How many gallons and liters does the 2021 Cadillac CT5 gas tank hold?
The 2021 Cadillac CT5 tank holds 64 liters, or 17.0 gallons in US gallons.
How far can a 2021 Cadillac CT5 go on a full tank?
About 459–544 miles on the highway and 306–391 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 CT5 go on a quarter tank?
About 136 highway miles or 98 in town from the 17.0-gallon tank, which has roughly 4.3 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 2021 Cadillac CT5 take?
Premium unleaded (recommended), or Premium unleaded (required), depending on the engine. The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 2021 Cadillac CT5?
At the US average of $5.28 a gallon for premium (EIA, week of October 26, 2026), filling the 17.0-gallon tank from empty costs $89.76. It ranges from $77.69 in the Gulf Coast to $108.12 in California.
How much does a full tank of gas weigh in a 2021 Cadillac CT5?
About 105 pounds for the 17.0-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 2021 Cadillac CT5 have a bigger gas tank than the Lexus ES 350?
Yes. The 2021 Cadillac CT5 holds up to 17.0 gallons; the 2021 Lexus ES 350 holds up to 15.9.
Has the 2021 Cadillac CT5 had a fuel pump or fuel system recall?
No. None of the 4 recalls NHTSA lists for the 2021 Cadillac CT5 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.