2020 head-to-head · Two-Seater
2020 Mercedes-Benz SL-Class vs Porsche 718
MPG, range and what each one really costs you to fuel, from official EPA ratings and recalculated with your own gas and electricity prices.
RWD · 4.0L 6-cyl · 6-speed manual · 19 MPG
The 2020 Mercedes-Benz SL-Class is the cheaper one to run. Driving 15,000 miles a year with $3.95/gal premium gas, it costs about $2,693 a year to fuel (22 MPG), versus $3,118 for the 2020 Porsche 718 (19 MPG). That's roughly $425 a year, or about $2,126 over five years.
Your numbers
Change these to match your driving and local prices. Every figure and chart on this page updates.
Fuel cost over 10 years
- Mercedes-Benz SL-Class
- Porsche 718
Side by side
| Mercedes-Benz SL-Class | Porsche 718 | |
|---|---|---|
| $2,693 | Your annual fuel cost | $3,118 |
| 22 MPG | Combined efficiency | 19 MPG |
| 20 MPG | City | 16 MPG |
| 28 MPG | Highway | 23 MPG |
| 395 g/mi | Tailpipe CO₂ (g/mi) | 473 g/mi |
| 4/10 | EPA fuel economy score | 3/10 |
| 4/10 | EPA greenhouse gas score | 3/10 |
| Gas | Powertrain | Gas |
| Premium gasoline | Fuel | Premium gasoline |
| 3.0L 6-cyl turbo | Engine / motor | 4.0L 6-cyl |
| 9-speed automatic | Transmission | 6-speed manual |
| RWD | Drivetrain | RWD |
✓ marks the better value. EPA scores run 1–10 (10 is best). Volumes come from the EPA interior volume index and aren't published for every body style.
Mercedes-Benz SL-Class vs Porsche 718 across model years
- Mercedes-Benz SL-Class
- Porsche 718
Annual fuel cost of the most efficient configuration of each model year, at your prices. Click a point to open that year.
How they differ
Among 39 2020 two-seaters, the Mercedes-Benz SL-Class ranks 11th and the Porsche 718 16th for lowest fuel cost.
Frequently asked questions
Which is more fuel-efficient, the 2020 Mercedes-Benz SL-Class or the 2020 Porsche 718?
Measured by cost to drive, the Mercedes-Benz SL-Class. The Mercedes-Benz SL-Class is rated 22 MPG combined and the Porsche 718 19 MPG (EPA, most efficient configuration of each).
How much does it cost to fuel the 2020 Mercedes-Benz SL-Class vs. the Porsche 718 per year?
At 15,000 miles a year with $3.95/gal premium gas, about $2,693 for the Mercedes-Benz SL-Class and $3,118 for the Porsche 718.
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