Mercedes-Benz · Large cars · Gasoline
Mercedes-Benz S-Class: MPG and annual fuel cost, 2026
Rated at 15 MPG combined for 2026, the Mercedes-Benz S-Class is 23rd of 25 large cars, in the bottom quarter.
- 15MPG combined23rd of 25 in class
- $5,500a year in fuel23rd of 25 in class
- 603g/mile CO2
Where it stands
Compared only with the gasoline models of its class it is 9th of 11 gasoline large cars, in the bottom quarter. The median of that narrower group is 21 MPG, against 28 MPG for all large cars together.
Across every class it is 175th of 180 gasoline models, in the bottom quarter.
Mercedes-Benz has 22 models in the 2026 data. This one ranks 22nd of them on combined rating, against a make median of 25.5 MPG.
In its class, just ahead of it is the Audi S8 at 18 MPG and just behind it is the Rolls-Royce Ghost at 14 MPG.
Fuel cost and CO2
Assuming 15,000 miles a year with 55% of them in the city and premium gasoline at $5.48 per gallon, fuelling the most efficient version comes to about $5,500 a year. That is $2,550 more than the large cars median of $2,950.
It emits 603 g of CO2 per mile from the tailpipe; the large cars median is 298, a difference of 305 g/mile.
Rated versions
In the city the most efficient version is rated 12 and on the highway 20, 8 better on the open road. The data lists one version for 2026: Maybach S680 4matic: 6.0 L, 12 cyl, Automatic 9-spd, AWD.
| Version | Combined MPG | City MPG | Highway MPG | Annual fuel cost | CO2 g/mile |
|---|---|---|---|---|---|
| Maybach S680 4matic: 6.0 L, 12 cyl, Automatic 9-spd, AWD | 15 | 12 | 20 | $5,500 | 603 |
Year by year
The Mercedes-Benz S-Class is in the data for 8 of the 8 model years from 2019 to 2026. Its best combined rating went from 22 in 2019 to 15 MPG in 2026, down 7 MPG. The number of rated versions shrank from 14 to 1. Fuel cost for the best version is $5,500 in the latest data against $3,750 in 2019, although the file applies today's fuel prices to every model year, so that change comes from the rating, not from prices.
| Model year | Versions | Best MPG | Lowest MPG | Fuel cost | CO2 g/mi | Class median |
|---|---|---|---|---|---|---|
| 2026 | 1 | 15 | 15 | $5,500 | 603 | 28 |
| 2025 | 1 | 15 | 15 | $5,500 | 603 | 26.5 |
| 2024 | 1 | 15 | 15 | $5,500 | 610 | 26.5 |
| 2023 | 1 | 14 | 14 | $5,850 | 618 | 23 |
| 2022 | 1 | 15 | 15 | $5,500 | 599 | 24 |
| 2021 | 4 | 20 | 17 | $4,100 | 454 | 23 |
| 2020 | 12 | 22 | 16 | $3,750 | 408 | 23 |
| 2019 | 14 | 22 | 16 | $3,750 | 408 | 23 |
Similar models
| Model | Powertrain | Combined MPG | Annual fuel cost | Model year |
|---|---|---|---|---|
| Rolls-Royce Ghost | Gasoline | 14 | $5,850 | 2026 |
| Audi S8 | Hybrid | 18 | $4,550 | 2026 |
| Dodge Charger | Gasoline | 20 | $3,350 | 2026 |
| Genesis G90 Hybrid | Hybrid | 20 | $4,100 | 2026 |
| Porsche Panamera | Gasoline | 21 | $3,900 | 2026 |
Compare and rank
Rankings: Large cars, Gasoline, Mercedes-Benz, Gasoline large cars.
Data: US EPA and DOE, as prepared in methods and data.