Mercedes-Benz AMG SL55 4matic Plus
16 MPG The 2026 Mercedes-Benz AMG SL55 4matic Plus is EPA-rated at 16 MPG combined (14 city / 21 highway). Over 15,000 miles a year that is about 938 gallons, $3000 a year in fuel, or $0.200 per mile at $3.20/gal.
Across its full 2022–2026 run it averages 16 MPG, essentially flat across 5 model years.
Running cost at different fuel prices and mileages
The figure everyone actually wants, and the one the EPA does not publish — because it depends on a fuel price no agency will commit to.
| Fuel price | Per mile | 10,000 mi/yr | 15,000 mi/yr | 20,000 mi/yr |
|---|---|---|---|---|
| $2.50/gal | $0.156 | $1563 | $2344 | $3125 |
| $3.00/gal | $0.188 | $1875 | $2813 | $3750 |
| $3.20/gal | $0.200 | $2000 | $3000 | $4000 |
| $3.50/gal | $0.219 | $2188 | $3281 | $4375 |
| $4.00/gal | $0.250 | $2500 | $3750 | $5000 |
| $4.50/gal | $0.281 | $2813 | $4219 | $5625 |
| $5.00/gal | $0.313 | $3125 | $4688 | $6250 |
Every model year
| Year | Combined | City | Highway | EPA fuel cost/yr | CO₂ g/mi | Trims |
|---|---|---|---|---|---|---|
| 2026 | 16 MPG | 14 | 21 | $4800 | 552 | 1 |
| 2025 | 16 MPG | 13 | 21 | $4800 | 558 | 1 |
| 2024 | 16 MPG | 14 | 21 | $4800 | 548 | 1 |
| 2023 | 16 MPG | 13 | 21 | $4800 | 562 | 1 |
| 2022 | 16 MPG | 14 | 21 | $4800 | 546 | 1 |
Where a model year offered several engines or drivetrains, the figure is the average across all EPA-tested trims that year — the trim count is shown so you can see how much averaging is involved.
How it compares in its class
Among the 68 minicompact cars models tracked here, the Mercedes-Benz AMG SL55 4matic Plus ranks 62 on current figures, against a class average of 22.6 MPG.
Closest more-efficient alternatives in the same class: Aston Martin DB11 V12 (17), Aston Martin DBS (17), Porsche 911 Turbo (17), Porsche 911 Carrera 4/2 (17.3), Jaguar XK Convertible (17.5).
Tailpipe CO₂ is rated at 552 grams per mile, which works out to roughly 8.3 tonnes a year at 15,000 miles.
Questions
What MPG does the Mercedes-Benz AMG SL55 4matic Plus get?
The 2026 Mercedes-Benz AMG SL55 4matic Plus is rated at 16 MPG combined by the EPA — 14 city and 21 highway. Across all 5 model years in the database it averages 16 MPG, ranging from 16 to 16 depending on year and trim.
How much does a Mercedes-Benz AMG SL55 4matic Plus cost in fuel per year?
At 16 MPG and 15,000 miles a year, it burns about 938 gallons — roughly $3000 a year with fuel at $3.20 a gallon, or $0.200 per mile. The EPA's own published annual figure for the 2026 model is $4800.
Has the Mercedes-Benz AMG SL55 4matic Plus become more efficient over time?
Barely. It sits at 16 MPG today against 16 in 2022 — essentially flat across 5 model years, with efficiency gains offset by weight and power creep.
Is the Mercedes-Benz AMG SL55 4matic Plus efficient for its class?
It ranks 62 of 68 in the Minicompact Cars class on current figures, against a class average of 22.6 MPG. That is 6.6 worse than typical for the class.
EPA test figures from fueleconomy.gov. Cost per mile and annual fuel spend are computed at a reference price of $3.20 per gallon — use your own price. Estimates based on official test figures and average fuel prices. Real-world consumption varies with driving style, load, terrain and maintenance.