Porsche 911 Turbo S Cabriolet
18 MPG The 2026 Porsche 911 Turbo S Cabriolet is EPA-rated at 18 MPG combined (15 city / 22 highway). Over 15,000 miles a year that is about 833 gallons, $2667 a year in fuel, or $0.178 per mile at $3.20/gal.
Across its full 2010–2026 run it averages 18.7 MPG, falling by 1 MPG over 15 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 | $0.139 | $1389 | $2083 | $2778 |
| $3.00/gal | $0.167 | $1667 | $2500 | $3333 |
| $3.20/gal | $0.178 | $1778 | $2667 | $3556 |
| $3.50/gal | $0.194 | $1944 | $2917 | $3889 |
| $4.00/gal | $0.222 | $2222 | $3333 | $4444 |
| $4.50/gal | $0.250 | $2500 | $3750 | $5000 |
| $5.00/gal | $0.278 | $2778 | $4167 | $5556 |
Every model year
| Year | Combined | City | Highway | EPA fuel cost/yr | CO₂ g/mi | Trims |
|---|---|---|---|---|---|---|
| 2026 | 18 MPG | 15 | 22 | $4300 | 504 | 1 |
| 2025 | 16 MPG | 14 | 20 | $4800 | 549 | 1 |
| 2024 | 16 MPG | 14 | 20 | $4800 | 549 | 1 |
| 2023 | 17 MPG | 15 | 20 | $4550 | 528 | 1 |
| 2022 | 17 MPG | 15 | 20 | $4550 | 528 | 1 |
| 2021 | 17 MPG | 15 | 20 | $4550 | 529 | 1 |
| 2019 | 21 MPG | 19 | 24 | $3650 | 430 | 1 |
| 2018 | 21 MPG | 19 | 24 | $3650 | 430 | 1 |
| 2017 | 21 MPG | 19 | 24 | $3650 | 430 | 1 |
| 2016 | 20 MPG | 17 | 24 | $3850 | 449 | 1 |
| 2014 | 20 MPG | 17 | 24 | $3850 | 449 | 1 |
| 2013 | 19 MPG | 16 | 24 | $4050 | 476 | 1 |
| 2012 | 19 MPG | 16 | 24 | $4050 | 468 | 1 |
| 2011 | 19 MPG | 16 | 24 | $4050 | 468 | 1 |
| 2010 | 19 MPG | 16 | 24 | $4050 | 468 | 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 Porsche 911 Turbo S Cabriolet ranks 53 on current figures, against a class average of 22.5 MPG.
Closest more-efficient alternatives in the same class: Jaguar XK (18.5), Porsche 944 (18.5), Audi Cabriolet (19), Jaguar XK8 Convertible (19), Lexus SC 430 (19).
Tailpipe CO₂ is rated at 504 grams per mile, which works out to roughly 7.6 tonnes a year at 15,000 miles.
Questions
What MPG does the Porsche 911 Turbo S Cabriolet get?
The 2026 Porsche 911 Turbo S Cabriolet is rated at 18 MPG combined by the EPA — 15 city and 22 highway. Across all 15 model years in the database it averages 18.7 MPG, ranging from 16 to 21 depending on year and trim.
How much does a Porsche 911 Turbo S Cabriolet cost in fuel per year?
At 18 MPG and 15,000 miles a year, it burns about 833 gallons — roughly $2667 a year with fuel at $3.20 a gallon, or $0.178 per mile. The EPA's own published annual figure for the 2026 model is $4300.
Has the Porsche 911 Turbo S Cabriolet become more efficient over time?
No — it has actually gone backwards, from 19 MPG in 2010 to 18 in 2026. That usually reflects the model growing heavier, more powerful, or moving upmarket rather than the engineering getting worse.
Is the Porsche 911 Turbo S Cabriolet efficient for its class?
It ranks 53 of 68 in the Minicompact Cars class on current figures, against a class average of 22.5 MPG. That is 4.5 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.