2025 Mercedes-Benz S-Class — Full Specifications
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The 2025 Mercedes-Benz S-Class is a saloon/sedan offered with 4 engines (3L 6-cyl turbo, 3L 6-cyl twin-charged, 4L 8-cyl turbo). Its most fuel-efficient configuration returns around 18 mpg (UK) / 15 mpg (US EPA) combined, with 18–29 mpg (UK) across all configurations. A hybrid version is also listed by EPA (3L 6-cyl twin-charged), returning around 29 mpg (UK) combined. Owners often keep a Mercedes-Benz S-Class workshop manual to hand for servicing and repairs.
Compared with the 2024 Mercedes-Benz S-Class: Fuel economy is essentially unchanged at around 18 mpg (UK) combined. EPA lists new engine options for 2025: 3L 6-cyl turbo. EPA passenger volume changes from 118 to 112 cu ft.
Full Specifications
| Engine (most efficient) | 6L 12-cyl turbo |
|---|---|
| Engine options | 3L 6-cyl turbo · 3L 6-cyl twin-charged · 4L 8-cyl turbo · 6L 12-cyl turbo |
| Transmission (most efficient) | Automatic 9-spd |
| Fuel Type | Premium Gasoline |
| Powertrain | Conventional |
| Drive | All-Wheel Drive |
| Body Style | Saloon/Sedan |
| Passenger Volume (EPA) | 112 cu ft (3,171 L) |
| Luggage Volume (EPA) | 12 cu ft (340 L) |
| Fuel Economy (UK) | 18 combined / 14 urban / 24 extra-urban mpg |
| Fuel Economy (US EPA) | 15 combined / 12 city / 20 highway mpg |
| CO₂ Emissions | 375 g/km |
| EPA Greenhouse Gas Score | 4 / 10 (10 = lowest emissions) |
| EPA Est. Annual Fuel Cost | $5,500 (15,000 mi/yr, US prices) |
Engine & Transmission Options
EPA lists 5 configurations for the 2025 Mercedes-Benz S-Class across 4 engines (3L 6-cyl turbo, 3L 6-cyl twin-charged, 4L 8-cyl turbo, 6L 12-cyl turbo). Combined fuel economy ranges from 15 to 24 mpg (US), or 18 to 29 mpg (UK), depending on engine, transmission and drive. The headline figures at the top of this page describe the most fuel-efficient configuration.
| Engine | Transmission | Drive | MPG (UK) | MPG (US) | CO₂ g/km | Fuel cost / yr |
|---|---|---|---|---|---|---|
| 3L 6-cyl turbo (Plug-in Hybrid) | Automatic 9-spd | All-Wheel Drive | 28 | 23 (20/29) | 66 | $3,550 |
| 3L 6-cyl twin-charged (Hybrid) | Automatic 9-spd | All-Wheel Drive | 29 | 24 (21/31) | 226 | $3,400 |
| 4L 8-cyl turbo (Hybrid) | Automatic 9-spd | All-Wheel Drive | 24 | 20 (16/27) | 280 | $4,100 |
| 4L 8-cyl turbo (Plug-in Hybrid) | Automatic 9-spd | All-Wheel Drive | 22 | 18 (15/23) | 190 | $4,550 |
| 6L 12-cyl turbo | Automatic 9-spd | All-Wheel Drive | 18 | 15 (12/20) | 375 | $5,500 |
MPG (US) shows combined, with city/highway in brackets. Highlighted row = the configuration used for the headline figures. Source: US EPA fueleconomy.gov.
EPA measures interior passenger volume at 112 cubic feet (about 3,171 litres) and luggage volume at 12 cubic feet (about 340 litres). These are US EPA interior-volume figures; they are measured differently from the boot capacity numbers UK manufacturers quote.
Owner Essentials for the 2025 Mercedes-Benz S-Class
Running Costs: 2025 Mercedes-Benz S-Class
Covering around 8,000 miles a year in a 2025 Mercedes-Benz S-Class at 18 mpg combined, expect roughly 2,020 litres of fuel annually — multiply by your local price per litre for a cost estimate. For US owners, the EPA estimates about $5,500 a year in fuel for the most efficient configuration (15,000 miles, national average prices). Work out exact fuel costs with the fuel cost calculator on 247Calculators.
Convert between MPG and L/100km with the unit converters on 247QuickTools. Not sure what tyre size fits? 247TyreCheck explains tyre sizing.
Only need this car occasionally? See our buy vs rent comparison.
2025 Mercedes-Benz S-Class Safety Ratings (NHTSA)
No NHTSA crash-test rating is on record for this model year. The NHTSA rates only a subset of vehicles each year; you can browse every rated vehicle on our NHTSA Safety Ratings hub.
How It Compares
Mercedes-Benz models in our database average about 26 mpg (UK) combined on their most efficient configuration; the 2025 Mercedes-Benz S-Class's 18 mpg is 8 mpg below that make average. Its 375 g/km CO₂ figure is 107 g/km higher than the 268 g/km Mercedes-Benz average.
Of the 17 Mercedes-Benz S-Class model years we cover, the 2025 ranks 13th for combined fuel economy on its best configuration (18 mpg UK combined, against a high of 26 mpg). See every Mercedes-Benz S-Class year side by side.
Last updated: · Data: US EPA (fueleconomy.gov) and NHTSA safety ratings 18 July 2026; NHTSA recalls and complaints 6 October 2026; Wikidata & curated EU catalogue 18 July 2026; European generation and engine data from Wikipedia 7 October 2026
Vehicle data sourced from manufacturer specifications. Always verify with your vehicle handbook or a qualified mechanic. This is a reference tool, not professional advice.
Recommended Accessories for the 2025 Mercedes-Benz S-Class
Frequently Asked Questions
What engine does the 2025 Mercedes-Benz S-Class have?
EPA lists 4 engines for the 2025 Mercedes-Benz S-Class: 3L 6-cyl turbo, 3L 6-cyl twin-charged, 4L 8-cyl turbo, 6L 12-cyl turbo. The most fuel-efficient configuration pairs the 6L 12-cyl turbo with a automatic 9-spd.
What is the fuel economy of the 2025 Mercedes-Benz S-Class?
The most efficient configuration returns around 18 mpg (UK) combined, or 15 mpg on the US EPA cycle. Across all configurations the UK combined figure runs from 18 to 29 mpg. The hybrid version returns around 29 mpg (UK) combined.
How much does the 2025 Mercedes-Benz S-Class cost to fuel per year?
The US EPA estimates about $5,500 a year in fuel for the most efficient configuration, based on 15,000 miles of mixed driving and national average fuel prices. Your own cost will depend on mileage and local prices.
How much interior and luggage space does the 2025 Mercedes-Benz S-Class have?
EPA measures interior passenger volume at 112 cubic feet (about 3,171 litres) and luggage volume at 12 cubic feet (about 340 litres). These are US EPA interior-volume figures, which are measured differently from the UK boot-capacity numbers manufacturers quote.