2020 Mercedes-Benz SL-Class mpg
Combined mpg, SL 450 Roadster RWD
22mpg
- 20 city, 28 highway.
- 1 mpg below the median of 25 convertibles (2020).
- 3 trims: 20 to 22 mpg.
12,000 miles a year. Gas $3.20.
| Trim | Engine | Drive | City mpg | Hwy mpg | Combined | Tank, gal | Miles per tank | Cost a year |
|---|---|---|---|---|---|---|---|---|
| SL 450 Roadster RWD | 3.0L 6cyl | RWD | 20 | 28 | 22 | 19.8 | 436 | $1,745 |
| SL 400 Roadster 2D RWD | 3.0L 6cyl | RWD | 20 | 28 | 22 | 19.8 | 436 | $1,745 |
| SL 550 Roadster RWD | 4.7L 8cyl | RWD | 17 | 25 | 20 | 19.8 | 396 | $1,920 |
Fuel cost
SL 450 Roadster RWD, 22 mpg combined.
- Per year
- $1,745
- Per month
- $145
- Per mile
- 14.5 cents
- Fill the tank
- $63.36
- Top trim: SL 550 Roadster RWD. $1,920 a year. $175 more than the SL 450 Roadster RWD.
Trip cost
| Trip | Gallons | Cost |
|---|---|---|
| 100 miles | 3.6 | $11.43 |
| 300 miles | 10.7 | $34.29 |
| 500 miles | 17.9 | $57.14 |
| 1,000 miles | 35.7 | $114 |
Commute cost
- Per month
- $126
- Per year
- $1,513
- Miles a month
- 867
SL 450 Roadster RWD. 20 miles each way, 5 days a week.
Is 22 mpg good? No. Beats 34% of 2026 cars.
MPG by year
Rivals
| Car | Cheapest trim | Combined mpg |
|---|---|---|
| 2020 Mercedes-Benz SL-Class | SL 450 Roadster RWD | 22 mpg |
| 2020 BMW 8 Series | 840i Gran Coupe RWD | 24 mpg |
| 2020 Porsche 911 | Carrera RWD | 20 mpg |
What this cannot tell you
EPA ratings. Your own mpg will differ.
Gas prices change by state and by week.
- 2 or more sources
- 1 source
- Model-level, rule or estimate
- Sources disagree