2026 Mercedes-Benz SL-Class — Full Specifications
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The 2026 Mercedes-Benz SL-Class is a coupe offered with 2 engines (2L 4-cyl turbo, 4L 8-cyl turbo). Its most fuel-efficient configuration returns around 19 mpg (UK) / 16 mpg (US EPA) combined, with 19–26 mpg (UK) across all configurations. A hybrid version is also listed by EPA (2L 4-cyl turbo), returning around 26 mpg (UK) combined. Owners often keep a Mercedes-Benz SL-Class workshop manual to hand for servicing and repairs.
Compared with the 2025 Mercedes-Benz SL-Class: Fuel economy is essentially unchanged at around 19 mpg (UK) combined. The engine line-up listed by EPA is unchanged.
Full Specifications
| Engine (most efficient) | 4L 8-cyl turbo |
|---|---|
| Engine options | 2L 4-cyl turbo · 4L 8-cyl turbo |
| Transmission (most efficient) | Automatic 9-spd |
| Fuel Type | Premium Gasoline |
| Powertrain | Conventional |
| Drive | All-Wheel Drive |
| Body Style | Coupe |
| Passenger Volume (EPA) | 76 cu ft (2,152 L) |
| Luggage Volume (EPA) | 6 cu ft (170 L) |
| Fuel Economy (UK) | 19 combined / 17 urban / 25 extra-urban mpg |
| Fuel Economy (US EPA) | 16 combined / 14 city / 21 highway mpg |
| CO₂ Emissions | 343 g/km |
| EPA Greenhouse Gas Score | 3 / 10 (10 = lowest emissions) |
| EPA Est. Annual Fuel Cost | $5,150 (15,000 mi/yr, US prices) |
Engine & Transmission Options
EPA lists 2 configurations for the 2026 Mercedes-Benz SL-Class across 2 engines (2L 4-cyl turbo, 4L 8-cyl turbo). Combined fuel economy ranges from 16 to 22 mpg (US), or 19 to 26 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 |
|---|---|---|---|---|---|---|
| 2L 4-cyl turbo (Hybrid) | Automatic 9-spd | Rear-Wheel Drive | 26 | 22 (19/27) | 249 | $3,750 |
| 4L 8-cyl turbo | Automatic 9-spd | All-Wheel Drive | 19 | 16 (14/21) | 343 | $5,150 |
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 76 cubic feet (about 2,152 litres) and luggage volume at 6 cubic feet (about 170 litres). These are US EPA interior-volume figures; they are measured differently from the boot capacity numbers UK manufacturers quote.
Owner Essentials for the 2026 Mercedes-Benz SL-Class
Running Costs: 2026 Mercedes-Benz SL-Class
Covering around 8,000 miles a year in a 2026 Mercedes-Benz SL-Class at 19 mpg combined, expect roughly 1,914 litres of fuel annually — multiply by your local price per litre for a cost estimate. For US owners, the EPA estimates about $5,150 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.
2026 Mercedes-Benz SL-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
How does the Mercedes-Benz SL-Class compare to similar coupes? For context, coupes in our database average around 25 mpg (UK) combined — this model's 19 mpg figure is 6 mpg below that average. Its 343 g/km CO₂ figure is 65 g/km higher than the 278 g/km average for coupes on this site. This comparison is based on 1072 coupes in our dataset.
Mercedes-Benz models in our database average about 26 mpg (UK) combined on their most efficient configuration; the 2026 Mercedes-Benz SL-Class's 19 mpg is 7 mpg below that make average. Its 343 g/km CO₂ figure is 75 g/km higher than the 268 g/km Mercedes-Benz average.
Of the 15 Mercedes-Benz SL-Class model years we cover, the 2026 ranks 11th for combined fuel economy on its best configuration (19 mpg UK combined, against a high of 28 mpg). See every Mercedes-Benz SL-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 2026 Mercedes-Benz SL-Class
Frequently Asked Questions
What engine does the 2026 Mercedes-Benz SL-Class have?
EPA lists 2 engines for the 2026 Mercedes-Benz SL-Class: 2L 4-cyl turbo, 4L 8-cyl turbo. The most fuel-efficient configuration pairs the 4L 8-cyl turbo with a automatic 9-spd.
What is the fuel economy of the 2026 Mercedes-Benz SL-Class?
The most efficient configuration returns around 19 mpg (UK) combined, or 16 mpg on the US EPA cycle. Across all configurations the UK combined figure runs from 19 to 26 mpg. The hybrid version returns around 26 mpg (UK) combined.
How much does the 2026 Mercedes-Benz SL-Class cost to fuel per year?
The US EPA estimates about $5,150 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 2026 Mercedes-Benz SL-Class have?
EPA measures interior passenger volume at 76 cubic feet (about 2,152 litres) and luggage volume at 6 cubic feet (about 170 litres). These are US EPA interior-volume figures, which are measured differently from the UK boot-capacity numbers manufacturers quote.
Is the Mercedes-Benz SL-Class's fuel economy good for a coupe?
It returns around 19 mpg (UK) combined, against a same-body-style average of roughly 25 mpg among the coupes we track.