Cadillac CT6 AWD
19 MPG The 2020 Cadillac CT6 AWD is EPA-rated at 19 MPG combined (16 city / 26 highway). Over 15,000 miles a year that is about 789 gallons, $2526 a year in fuel, or $0.168 per mile at $3.20/gal.
Across its full 2016–2020 run it averages 20.3 MPG, falling by 2 MPG over 5 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 | $0.132 | $1316 | $1974 | $2632 |
| $3.00/gal | $0.158 | $1579 | $2368 | $3158 |
| $3.20/gal | $0.168 | $1684 | $2526 | $3368 |
| $3.50/gal | $0.184 | $1842 | $2763 | $3684 |
| $4.00/gal | $0.211 | $2105 | $3158 | $4211 |
| $4.50/gal | $0.237 | $2368 | $3553 | $4737 |
| $5.00/gal | $0.263 | $2632 | $3947 | $5263 |
Every model year
| Year | Combined | City | Highway | EPA fuel cost/yr | CO₂ g/mi | Trims |
|---|---|---|---|---|---|---|
| 2020 | 19 MPG | 16 | 26 | $3750 | 471 | 2 |
| 2019 | 19.7 MPG | 16.7 | 26 | $3717 | 457 | 3 |
| 2018 | 21 MPG | 18 | 26.5 | $3300 | 420 | 2 |
| 2017 | 21 MPG | 18 | 26.5 | $3300 | 421 | 2 |
| 2016 | 21 MPG | 18 | 26.5 | $3300 | 419 | 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 149 large cars models tracked here, the Cadillac CT6 AWD ranks 69 on current figures, against a class average of 21.6 MPG.
Closest more-efficient alternatives in the same class: Buick Lucerne (19.5), Jaguar XJ (19.5), Jaguar XJL (19.5), Pontiac Bonneville (19.5), Saab 9000 (19.5).
Tailpipe CO₂ is rated at 471 grams per mile, which works out to roughly 7.1 tonnes a year at 15,000 miles.
Questions
What MPG does the Cadillac CT6 AWD get?
The 2020 Cadillac CT6 AWD is rated at 19 MPG combined by the EPA — 16 city and 26 highway. Across all 5 model years in the database it averages 20.3 MPG, ranging from 17 to 21 depending on year and trim.
How much does a Cadillac CT6 AWD cost in fuel per year?
At 19 MPG and 15,000 miles a year, it burns about 789 gallons — roughly $2526 a year with fuel at $3.20 a gallon, or $0.168 per mile. The EPA's own published annual figure for the 2020 model is $3750.
Has the Cadillac CT6 AWD become more efficient over time?
No — it has actually gone backwards, from 21 MPG in 2016 to 19 in 2020. That usually reflects the model growing heavier, more powerful, or moving upmarket rather than the engineering getting worse.
Is the Cadillac CT6 AWD efficient for its class?
It ranks 69 of 149 in the Large Cars class on current figures, against a class average of 21.6 MPG. That is 2.6 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.