- Newest year: 2020
- Gas
- Large cars
2016-2020 Cadillac CT6 MPG & Fuel Cost
5 model years · 17–28 MPG combined
15,000 mi/yr · regular gasoline $4.36/gal (U.S. average, Sep 2026)
Cheaper to fuel than 6 of 10 large car configurations, MY2020. Ranked against all rated configurations, not sales-weighted.
2016-2020 Cadillac CT6 at a glance
The 2016-2020 Cadillac CT6 covers 5 model years in the EPA database (17 configurations in all), rated 17–28 MPG combined. The newest model year, 2020, costs about $3,080 a year to fuel for its most efficient version, the CT6 3.6L 6-cyl AWD (21 MPG), at regular gasoline $4.36/gal (U.S. average, Sep 2026). Powertrains over the years: gas and plug-in hybrid. EPA changed the ratings in 2017, 2018, 2019 and 2020. The best combined rating in the generation, 28 MPG, was reached in 2019.
2016-2020 Cadillac CT6 by model year
| Model year | Powertrains | Combined | $/yr | EPA ratings |
|---|---|---|---|---|
| 2020 | Gas | 17–21 MPG | $3,080–$4,710 | Ratings changed |
| 2019 | Gas | 17–28 MPG | $2,870–$4,710 | Ratings changed |
| 2018 | Gas, Plug-in hybrid | 21–25 MPG | $2,160–$3,840 | Ratings changed |
| 2017 | Gas, Plug-in hybrid | 21–25 MPG | $2,160–$3,840 | Ratings changed |
| 2016 | Gas | 21–25 MPG | $2,640–$3,840 | First year |
What the 2020 CT6 3.6L 6-cyl AWD costs to drive
Per month
$257
$3,080 a year ÷ 12
Per 25 miles
$5.13
Per 100 miles
$20.53
Five years
$15,400
5 × the yearly cost, prices held at today's level
vs the large car median
$240less a year
Class median $3,320 a year, MY2020
Based on 15,000 miles a year and regular gasoline $4.36/gal (U.S. average, Sep 2026).
2020 Cadillac CT6 MPG
Versus 2019: The most efficient configuration moves from 28 to 21 MPG, down 7. Its annual cost goes from $2,870 to $3,080, $210 more.
Gas configurations (2)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| CT6 3.6L 6-cyl (Most efficient) | 3.6L 6-cyl | AWD | 18 | 27 | 21 | $3,080 |
| CT6 4.2L 8-cyl turbo | 4.2L 8-cyl turbo | AWD | 14 | 25 | 17 | $4,710 |
1 configuration requires or recommends higher-octane gasoline and is costed at premium gasoline $5.36/gal (U.S. average, Sep 2026).
2019 Cadillac CT6 MPG
17–28 MPG · $2,870–$4,710/yr
Versus 2018: The most efficient configuration moves from 25 to 28 MPG, up 3. Its annual cost goes from $3,250 to $2,870, $380 less.
Gas configurations (4)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| CT6 2.0L 4-cyl turbo (Most efficient) | 2.0L 4-cyl turbo | RWD | 24 | 34 | 28 | $2,870 |
| CT6 3.6L 6-cyl | 3.6L 6-cyl | AWD | 18 | 27 | 21 | $3,080 |
| CT6 3.0L 6-cyl turbo | 3.0L 6-cyl turbo | AWD | 18 | 26 | 21 | $3,870 |
| CT6 4.2L 8-cyl turbo | 4.2L 8-cyl turbo | AWD | 14 | 25 | 17 | $4,710 |
3 configurations require or recommend higher-octane gasoline and are costed at premium gasoline $5.36/gal (U.S. average, Sep 2026).
2018 Cadillac CT6 MPG
21–25 MPG · $2,160–$3,840/yr
Versus 2017: The most efficient configuration stays at 25 MPG. Its annual cost stays at $3,250.
On electricity 62 MPGe, with 31 miles of electric range.
See plug-in hybrid configurationsGas configurations (3)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| CT6 2.0L 4-cyl turbo (Most efficient) | 2.0L 4-cyl turbo | RWD | 22 | 30 | 25 | $3,250 |
| CT6 3.6L 6-cyl | 3.6L 6-cyl | AWD | 18 | 27 | 21 | $3,060 |
| CT6 3.0L 6-cyl turbo | 3.0L 6-cyl turbo | AWD | 18 | 26 | 21 | $3,840 |
2 configurations require or recommend higher-octane gasoline and are costed at premium gasoline $5.36/gal (U.S. average, Sep 2026).
Plug-in hybrid configurations (1)
| Trim | Drive | Gas MPG | Electric MPGe | Electric range | $/yr |
|---|---|---|---|---|---|
| Plug-In (Most efficient) | RWD | 25 | 62 | 31 mi | $2,160 |
Cost assumes EPA's utility factor: 59% of miles are driven on electricity (residential electricity 18.3¢/kWh (U.S. average, Jul 2026)) and the rest on gasoline (premium gasoline $5.36/gal (U.S. average, Sep 2026)).
2017 Cadillac CT6 MPG
21–25 MPG · $2,160–$3,840/yr
Versus 2016: The most efficient configuration stays at 25 MPG. Its annual cost goes from $2,640 to $3,250, $610 more.
On electricity 62 MPGe, with 31 miles of electric range.
See plug-in hybrid configurationsGas configurations (3)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| CT6 2.0L 4-cyl turbo (Most efficient) | 2.0L 4-cyl turbo | RWD | 22 | 30 | 25 | $3,250 |
| CT6 3.6L 6-cyl | 3.6L 6-cyl | AWD | 18 | 27 | 21 | $3,060 |
| CT6 3.0L 6-cyl turbo | 3.0L 6-cyl turbo | AWD | 18 | 26 | 21 | $3,840 |
2 configurations require or recommend higher-octane gasoline and are costed at premium gasoline $5.36/gal (U.S. average, Sep 2026).
Plug-in hybrid configurations (1)
| Trim | Drive | Gas MPG | Electric MPGe | Electric range | $/yr |
|---|---|---|---|---|---|
| Plug-In (Most efficient) | RWD | 26 | 62 | 31 mi | $2,160 |
Cost assumes EPA's utility factor: 59% of miles are driven on electricity (residential electricity 18.3¢/kWh (U.S. average, Jul 2026)) and the rest on gasoline (premium gasoline $5.36/gal (U.S. average, Sep 2026)).
2016 Cadillac CT6 MPG
21–25 MPG · $2,640–$3,840/yr
Gas configurations (3)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| CT6 2.0L 4-cyl turbo (Most efficient) | 2.0L 4-cyl turbo | RWD | 22 | 30 | 25 | $2,640 |
| CT6 3.6L 6-cyl | 3.6L 6-cyl | AWD | 18 | 27 | 21 | $3,050 |
| CT6 3.0L 6-cyl turbo | 3.0L 6-cyl turbo | AWD | 18 | 26 | 21 | $3,840 |
1 configuration requires or recommends higher-octane gasoline and is costed at premium gasoline $5.36/gal (U.S. average, Sep 2026).
Fuel cost by state
Yearly cost of the CT6 3.6L 6-cyl AWD: $4,200 in California and $2,690 in Texas, a $1,510 difference.
- California $4,200
- Washington $3,890
- New York $3,080
- Florida $2,910
- Texas $2,690
Similar cars
Closest combined MPG among MY2020 large car models.
Generations
- 2016-2020 (1st gen)
Frequently asked questions
What gas mileage does the 2016-2020 Cadillac CT6 get?
EPA rates the 2016-2020 Cadillac CT6 at 17–28 MPG combined across 17 configurations and 5 model years. The most efficient version, the 2019 CT6 2.0L 4-cyl turbo RWD, is rated 28 MPG (24 city, 34 highway). By powertrain: Gas: 17–28 MPG; Plug-in hybrid: 25–26 MPG.
Which years had the best MPG in the 2016-2020 Cadillac CT6?
The CT6 2.0L 4-cyl turbo RWD reached the generation's best combined rating, 28 MPG, in 2019. The lowest top rating, 21 MPG, was in 2020.
Did EPA ratings change during the 2016-2020 Cadillac CT6?
Yes. Ratings changed in 2017, 2018, 2019 and 2020.
How much does it cost to fuel a 2020 Cadillac CT6 per year?
Driving 15,000 miles a year at regular gasoline $4.36/gal (U.S. average, Sep 2026), the CT6 3.6L 6-cyl AWD costs about $3,080 a year. Across all 2 configurations the cost runs $3,080–$4,710 a year. That is a $1,630 difference between the cheapest and the costliest configuration.
How much does it cost to drive a 2020 Cadillac CT6 100 miles?
About $20.53 per 100 miles for the CT6 3.6L 6-cyl AWD at regular gasoline $4.36/gal (U.S. average, Sep 2026), and between $20.53 and $31.40 across all configurations. That is the annual cost over 15,000 miles divided by 150.
Is the 2020 Cadillac CT6 more efficient in the city or on the highway?
The CT6 3.6L 6-cyl AWD is rated 18 city and 27 highway MPG, so it is more efficient on the highway, by 9 MPG.
How does the 2020 Cadillac CT6 compare with other large car configurations?
The CT6 3.6L 6-cyl AWD costs about $3,080 a year to fuel, $240 less than the class median of $3,320, and less than 6 of 10 large car configurations. The comparison covers all 115 rated large car configurations for MY2020, not weighted by sales.
Is the 2020 Cadillac CT6 different from the 2019 model?
The most efficient configuration moves from 28 to 21 MPG, down 7. Its annual cost goes from $2,870 to $3,080, $210 more. EPA lists 2 configurations for 2020 against 4 configurations for 2019. See the 2019 Cadillac CT6 for that year.