Mercedes-Benz S550
21 MPG The 2017 Mercedes-Benz S550 is EPA-rated at 21 MPG combined (18 city / 26 highway). Over 15,000 miles a year that is about 714 gallons, $2286 a year in fuel, or $0.152 per mile at $3.20/gal.
Across its full 2007–2017 run it averages 18.6 MPG, improving by 4 MPG over 11 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 | $0.119 | $1190 | $1786 | $2381 |
| $3.00/gal | $0.143 | $1429 | $2143 | $2857 |
| $3.20/gal | $0.152 | $1524 | $2286 | $3048 |
| $3.50/gal | $0.167 | $1667 | $2500 | $3333 |
| $4.00/gal | $0.190 | $1905 | $2857 | $3810 |
| $4.50/gal | $0.214 | $2143 | $3214 | $4286 |
| $5.00/gal | $0.238 | $2381 | $3571 | $4762 |
Every model year
| Year | Combined | City | Highway | EPA fuel cost/yr | CO₂ g/mi | Trims |
|---|---|---|---|---|---|---|
| 2017 | 21 MPG | 18 | 26 | $3650 | 434 | 1 |
| 2016 | 20 MPG | 17 | 26 | $3850 | 444 | 1 |
| 2015 | 20 MPG | 17 | 26 | $3850 | 444 | 1 |
| 2014 | 20 MPG | 17 | 26 | $3850 | 444 | 1 |
| 2013 | 19 MPG | 15 | 25 | $4050 | 479 | 1 |
| 2012 | 19 MPG | 15 | 25 | $4050 | 468 | 1 |
| 2011 | 18 MPG | 15 | 23 | $4300 | 494 | 1 |
| 2010 | 18 MPG | 15 | 23 | $4300 | 494 | 1 |
| 2009 | 17 MPG | 14 | 22 | $4550 | 523 | 1 |
| 2008 | 16 MPG | 14 | 21 | $4800 | 555 | 1 |
| 2007 | 17 MPG | 14 | 22 | $4550 | 523 | 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 149 large cars models tracked here, the Mercedes-Benz S550 ranks 31 on current figures, against a class average of 21.6 MPG.
Closest more-efficient alternatives in the same class: Audi A8 L (22), BMW 535i Gran Turismo (22), BMW 740Li (22), Cadillac XTS (22), Chevrolet Impala (22).
Tailpipe CO₂ is rated at 434 grams per mile, which works out to roughly 6.5 tonnes a year at 15,000 miles.
Questions
What MPG does the Mercedes-Benz S550 get?
The 2017 Mercedes-Benz S550 is rated at 21 MPG combined by the EPA — 18 city and 26 highway. Across all 11 model years in the database it averages 18.6 MPG, ranging from 16 to 21 depending on year and trim.
How much does a Mercedes-Benz S550 cost in fuel per year?
At 21 MPG and 15,000 miles a year, it burns about 714 gallons — roughly $2286 a year with fuel at $3.20 a gallon, or $0.152 per mile. The EPA's own published annual figure for the 2017 model is $3650.
Has the Mercedes-Benz S550 become more efficient over time?
Yes. It has gone from 17 MPG in 2007 to 21 in 2017 — an improvement of 4 MPG, or 24% across 11 model years.
Is the Mercedes-Benz S550 efficient for its class?
It ranks 31 of 149 in the Large Cars class on current figures, against a class average of 21.6 MPG. That is 0.6 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.