Cadillac CT5
24 MPG The 2026 Cadillac CT5 is EPA-rated at 24 MPG combined (20.5 city / 29.5 highway). Over 15,000 miles a year that is about 625 gallons, $2000 a year in fuel, or $0.133 per mile at $3.20/gal.
Across its full 2020–2026 run it averages 24.1 MPG, essentially flat across 7 model years.
Running cost at different fuel prices and mileages
The figure everyone actually wants, and the one the EPA does not publish — because it depends on a fuel price no agency will commit to.
| Fuel price | Per mile | 10,000 mi/yr | 15,000 mi/yr | 20,000 mi/yr |
|---|---|---|---|---|
| $2.50/gal | $0.104 | $1042 | $1563 | $2083 |
| $3.00/gal | $0.125 | $1250 | $1875 | $2500 |
| $3.20/gal | $0.133 | $1333 | $2000 | $2667 |
| $3.50/gal | $0.146 | $1458 | $2188 | $2917 |
| $4.00/gal | $0.167 | $1667 | $2500 | $3333 |
| $4.50/gal | $0.188 | $1875 | $2813 | $3750 |
| $5.00/gal | $0.208 | $2083 | $3125 | $4167 |
Every model year
| Year | Combined | City | Highway | EPA fuel cost/yr | CO₂ g/mi | Trims |
|---|---|---|---|---|---|---|
| 2026 | 24 MPG | 20.5 | 29.5 | $3225 | 373 | 2 |
| 2025 | 24 MPG | 21 | 30 | $3225 | 370 | 2 |
| 2024 | 24.5 MPG | 21 | 30 | $3175 | 370 | 2 |
| 2023 | 24.5 MPG | 21 | 30 | $3175 | 369 | 2 |
| 2022 | 24.5 MPG | 21 | 30 | $3175 | 369 | 2 |
| 2021 | 24 MPG | 21 | 30 | $3225 | 371 | 2 |
| 2020 | 23.5 MPG | 21 | 29 | $3300 | 375 | 2 |
Where a model year offered several engines or drivetrains, the figure is the average across all EPA-tested trims that year — the trim count is shown so you can see how much averaging is involved.
How it compares in its class
Among the 261 midsize cars models tracked here, the Cadillac CT5 ranks 114 on current figures, against a class average of 27.2 MPG.
Closest more-efficient alternatives in the same class: Mercury Milan (24.5), Audi A7 quattro (25), Jaguar XF AWD (25), Lexus ES 350 (25), Lexus ES 350 F Sport (25).
Tailpipe CO₂ is rated at 373 grams per mile, which works out to roughly 5.6 tonnes a year at 15,000 miles.
Questions
What MPG does the Cadillac CT5 get?
The 2026 Cadillac CT5 is rated at 24 MPG combined by the EPA — 20.5 city and 29.5 highway. Across all 7 model years in the database it averages 24.1 MPG, ranging from 21 to 27 depending on year and trim.
How much does a Cadillac CT5 cost in fuel per year?
At 24 MPG and 15,000 miles a year, it burns about 625 gallons — roughly $2000 a year with fuel at $3.20 a gallon, or $0.133 per mile. The EPA's own published annual figure for the 2026 model is $3225.
Has the Cadillac CT5 become more efficient over time?
Barely. It sits at 24 MPG today against 23.5 in 2020 — essentially flat across 7 model years, with efficiency gains offset by weight and power creep.
Is the Cadillac CT5 efficient for its class?
It ranks 114 of 261 in the Midsize Cars class on current figures, against a class average of 27.2 MPG. That is 3.2 worse than typical for the class.
EPA test figures from fueleconomy.gov. Cost per mile and annual fuel spend are computed at a reference price of $3.20 per gallon — use your own price. Estimates based on official test figures and average fuel prices. Real-world consumption varies with driving style, load, terrain and maintenance.