- Gas
- Large cars
- MY2016–2020
Cadillac CT6 MPG & Fuel Cost by Year
5 model years · 2016–2020
15,000 mi/yr · regular gasoline $4.36/gal (U.S. average, Sep 2026)
Cadillac CT6 fuel economy at a glance
EPA has rated the Cadillac CT6 for 5 model years, 2016 to 2020. Across those years its combined rating runs 17–28 MPG. The latest model year, 2020, has 2 configurations rated 17–21 MPG combined and costing $3,080–$4,710 a year to fuel at regular gasoline $4.36/gal (U.S. average, Sep 2026). The most efficient configuration on record since 2016 is the 2019 CT6 2.0L 4-cyl turbo RWD, at 28 MPG.
Cadillac CT6 MPG by year
| Year | Gas (MPG) | Plug-in hybrid, gas only (MPG) | $/yr |
|---|---|---|---|
| 2016-2020 (1st gen) Generation page | |||
| 2020 | 17–21 | — | $3,080–$4,710 |
| 2019 | 17–28 | — | $2,870–$4,710 |
| 2018 | 21–25 | 25 | $2,160–$3,840 |
| 2017 | 21–25 | 26 | $2,160–$3,840 |
| 2016 | 21–25 | — | $2,640–$3,840 |
Costs use the current EIA price set and 15,000 miles a year for every year, so years are comparable. Green marks the best year for each powertrain.
Cadillac CT6 generations
1 generations between 2016 and 2020. Open one for the table of every model year and configuration.
2020 powertrain options
More Cadillac models
Frequently asked questions
What is the Cadillac CT6's gas mileage by year?
EPA combined ratings for the Cadillac CT6 run 17–28 MPG across model years 2016 to 2020. The latest year, 2020, is rated 17–21 MPG.
Which Cadillac CT6 model year has the best gas mileage?
The 2019 Cadillac CT6 CT6 2.0L 4-cyl turbo RWD has the highest combined rating since 2016, at 28 MPG.
How much does a Cadillac CT6 cost to fuel per year?
For MY2020, EPA-rated configurations cost $3,080–$4,710 a year to fuel, driving 15,000 miles at regular gasoline $4.36/gal (U.S. average, Sep 2026). The most efficient one costs $3,080.
Has the Cadillac CT6's fuel economy improved over time?
No. The most efficient configuration moved from 25 MPG in 2016 to 21 MPG in 2020, 4 MPG less.
Is there a hybrid, plug-in or electric Cadillac CT6?
Yes. Plug-in hybrid versions are rated from 2017 to 2018 (25–26 MPG).