The Cadillac CT4 does 23.4 mpg combined (19.8 city, 29.3 highway), which works out to about $1,641 a year in fuel at $3.20 a gallon and 12,000 miles. Engine choice matters more than you'd think: 2L 4-cyl does 26.6 mpg while 3.6L 6-cyl does 19 — a difference of $577 a year. Against other 4-cyl cars it sits below the average of 25.7 mpg.
Every Cadillac CT4 engine, compared
Gas mileage on the Cadillac CT4 ranges from 26.6 down to 19 depending on which engine sits under the bonnet — a spread of $577 a year across 2 versions of the same car. Picking the right one often saves more fuel than picking a different car altogether. Yearly cost assumes 12,000 miles at $3.20 a gallon.
| Engine | Combined | City / Highway | Years | Fuel per year |
|---|---|---|---|---|
| 2L 4-cyl | 22.6 / 33.1 | 2020–2026 | $1,444 | |
| 3.6L 6-cyl | 16 / 24 | 2022–2026 | $2,021 |
What that actually costs
The Cadillac CT4 burns a gallon every 23.4 miles, so 12,000 miles takes about 513 gallons a year. At $3.20 that is what the table below adds up to.
| Measure | Value |
|---|---|
| Cost per mile | $0.137 |
| Fuel per year | $1,641 |
| Fuel over five years | $8,205 |
| Against other 4-cyl cars | +$147 a year |
| EPA's own estimate | $3,375 a year |
City or highway — who is this car for
The Cadillac CT4 gives up 9.5 mpg the moment you leave the motorway — 29.3 out there against 19.8 in town, a 48% drop worth $628 a year. A wide gap punishes stop-and-start traffic; a narrow one means the car doesn't care where you drive it.
| Measure | Value | Reading |
|---|---|---|
| City | 19.8 mpg | $1,939 a year if you only drive in town |
| Highway | 29.3 mpg | $1,311 a year if you mostly commute |
| Gap | +9.5 mpg (48%) | Wide — this car dislikes traffic |
How the CT4 changed over the years
The CT4 peaked in 2021 at 27 mpg (23 city, 34 highway) and was at its thirstiest in 2026 at 22.5 — 4.5 mpg apart, or $285 a year in fuel between buying one year and the other. The 2026 car does 22.5. Jumps usually mark a new generation or a new engine; dips often mean a heavier body or added all-wheel drive.
| Model year | Combined | City / Highway | Engines offered | Fuel per year |
|---|---|---|---|---|
| 2026 | 19 / 28 | 2 | $1,707 | |
| 2025 | 19 / 28 | 2 | $1,707 | |
| 2024 | 19 / 28 | 2 | $1,707 | |
| 2023 | 19.5 / 29 | 2 | $1,670 | |
| 2022 | 19.5 / 29 | 2 | $1,670 | |
| 2021 | 23 / 34 | 1 | $1,422 | |
| 2020 | 23 / 34 | 1 | $1,422 |
MPG is a number. Dollars per year is the answer.
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How we count
This page rests on 12 EPA ratings of the Cadillac CT4 — 2 engines across 2020–2026. The mileage is EPA's laboratory figure, unchanged; the yearly bill is ours, at 12,000 miles and $3.20 a gallon, against EPA's own estimate of $3,375. Full method.
Frequently asked questions
What mpg does the Cadillac CT4 get?
23.4 mpg combined on average — 19.8 in the city and 29.3 on the highway, per EPA ratings across 2020–2026.
How much does a Cadillac CT4 cost in fuel per year?
About $1,641 at 12,000 miles and $3.20 a gallon — roughly $8,205 over five years, or 0.137 dollars a mile.
Which CT4 engine is the most economical?
The 2L 4-cyl at 26.6 mpg, against 19 for the 3.6L 6-cyl — a difference of about $577 a year.
Is the CT4 good on fuel compared with similar cars?
Against other 4-cyl cars it sits below the average of 25.7 mpg, computed across 4765 ratings.
Are these real-world CT4 figures?
No — they are EPA laboratory ratings, the same ones printed on the window sticker, and EPA's own annual fuel estimate for the Cadillac CT4 is $3,375 against the $1,641 we compute at 12,000 miles. Expect a little worse in practice: the spread between the 27 and 19 mpg versions of this car is smaller than the spread between two drivers of the same one.
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