2018 head-to-head · Large Car
2018 Cadillac CT6 vs Mercedes-Benz S-Class
MPG, range and what each one really costs you to fuel, from official EPA ratings and recalculated with your own gas and electricity prices.
The 2018 Cadillac CT6 is the cheaper one to run. Driving 15,000 miles a year with $3.10/gal regular gas and $3.95/gal premium gas, it costs about $2,214 a year to fuel (21 MPG), versus $2,693 for the 2018 Mercedes-Benz S-Class (22 MPG). That's roughly $479 a year, or about $2,394 over five years.
Your numbers
Change these to match your driving and local prices. Every figure and chart on this page updates.
Fuel cost over 10 years
- Cadillac CT6
- Mercedes-Benz S-Class
Side by side
| Cadillac CT6 | Mercedes-Benz S-Class | |
|---|---|---|
| $2,214 | Your annual fuel cost | $2,693 |
| 21 MPG | Combined efficiency | 22 MPG |
| 18 MPG | City | 19 MPG |
| 27 MPG | Highway | 28 MPG |
| 110 cu ft | Passenger volume | 112 cu ft |
| 15 cu ft | Cargo volume | 12 cu ft |
| 416 g/mi | Tailpipe CO₂ (g/mi) | 403 g/mi |
| 4/10 | EPA fuel economy score | 4/10 |
| 4/10 | EPA greenhouse gas score | 4/10 |
| Gas | Powertrain | Gas |
| Regular gasoline | Fuel | Premium gasoline |
| 3.6L 6-cyl | Engine / motor | 3.0L 6-cyl turbo |
| 8-speed automatic | Transmission | 9-speed automatic |
| AWD | Drivetrain | RWD |
✓ marks the better value. EPA scores run 1–10 (10 is best). Volumes come from the EPA interior volume index and aren't published for every body style.
Cadillac CT6 vs Mercedes-Benz S-Class across model years
- Cadillac CT6
- Mercedes-Benz S-Class
Annual fuel cost of the most efficient configuration of each model year, at your prices. Click a point to open that year.
How they differ
Per EPA interior volume figures, the Cadillac CT6 has more cargo space (15 vs. 12 cu ft).
Among 31 2018 large cars, the Cadillac CT6 ranks 19th and the Mercedes-Benz S-Class 25th for lowest fuel cost.
Frequently asked questions
Which is more fuel-efficient, the 2018 Cadillac CT6 or the 2018 Mercedes-Benz S-Class?
Measured by cost to drive, the Cadillac CT6. The Cadillac CT6 is rated 21 MPG combined and the Mercedes-Benz S-Class 22 MPG (EPA, most efficient configuration of each).
How much does it cost to fuel the 2018 Cadillac CT6 vs. the Mercedes-Benz S-Class per year?
At 15,000 miles a year with $3.10/gal regular gas and $3.95/gal premium gas, about $2,214 for the Cadillac CT6 and $2,693 for the Mercedes-Benz S-Class.
Which has more cargo space?
The Cadillac CT6, with 15 cu ft of luggage volume versus 12 cu ft (EPA interior volume index).
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