2015 head-to-head · Two-Seater
2015 Mercedes-Benz SLS AMG vs Porsche Cayman
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 · 6.2L 8-cyl · 7-speed dual-clutch · 15 MPG
The 2015 Porsche Cayman is the cheaper one to run. Driving 15,000 miles a year with $3.95/gal premium gas, it costs about $2,370 a year to fuel (25 MPG), versus $3,950 for the 2015 Mercedes-Benz SLS AMG (15 MPG). That's roughly $1,580 a year, or about $7,900 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 SLS AMG
- Porsche Cayman
Side by side
| Mercedes-Benz SLS AMG | Porsche Cayman | |
|---|---|---|
| $3,950 | Your annual fuel cost | $2,370 |
| 15 MPG | Combined efficiency | 25 MPG |
| 13 MPG | City | 22 MPG |
| 19 MPG | Highway | 31 MPG |
| 589 g/mi | Tailpipe CO₂ (g/mi) | 352 g/mi |
| 3/10 | EPA fuel economy score | 6/10 |
| 3/10 | EPA greenhouse gas score | 6/10 |
| Gas | Powertrain | Gas |
| Premium gasoline | Fuel | Premium gasoline |
| 6.2L 8-cyl | Engine / motor | 2.7L 6-cyl |
| 7-speed dual-clutch | Transmission | 7-speed dual-clutch |
| 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 SLS AMG vs Porsche Cayman across model years
- Mercedes-Benz SLS AMG
- Porsche Cayman
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 33 2015 two-seaters, the Mercedes-Benz SLS AMG ranks 26th and the Porsche Cayman 13th for lowest fuel cost.
Frequently asked questions
Which is more fuel-efficient, the 2015 Mercedes-Benz SLS AMG or the 2015 Porsche Cayman?
Measured by cost to drive, the Porsche Cayman. The Mercedes-Benz SLS AMG is rated 15 MPG combined and the Porsche Cayman 25 MPG (EPA, most efficient configuration of each).
How much does it cost to fuel the 2015 Mercedes-Benz SLS AMG vs. the Porsche Cayman per year?
At 15,000 miles a year with $3.95/gal premium gas, about $3,950 for the Mercedes-Benz SLS AMG and $2,370 for the Porsche Cayman.
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