Porsche 911 Carrera 4 Cabriolet
20 MPG The 2024 Porsche 911 Carrera 4 Cabriolet is EPA-rated at 20 MPG combined (18 city / 24 highway). Over 15,000 miles a year that is about 750 gallons, $2400 a year in fuel, or $0.160 per mile at $3.20/gal.
Across its full 2002–2024 run it averages 21 MPG, improving by 2.5 MPG over 16 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 | $0.125 | $1250 | $1875 | $2500 |
| $3.00/gal | $0.150 | $1500 | $2250 | $3000 |
| $3.20/gal | $0.160 | $1600 | $2400 | $3200 |
| $3.50/gal | $0.175 | $1750 | $2625 | $3500 |
| $4.00/gal | $0.200 | $2000 | $3000 | $4000 |
| $4.50/gal | $0.225 | $2250 | $3375 | $4500 |
| $5.00/gal | $0.250 | $2500 | $3750 | $5000 |
Every model year
| Year | Combined | City | Highway | EPA fuel cost/yr | CO₂ g/mi | Trims |
|---|---|---|---|---|---|---|
| 2024 | 20 MPG | 18 | 24 | $3850 | 443 | 1 |
| 2023 | 20 MPG | 18 | 24 | $3850 | 443 | 1 |
| 2022 | 20 MPG | 18 | 24 | $3850 | 443 | 1 |
| 2021 | 20 MPG | 18 | 24 | $3850 | 443 | 1 |
| 2020 | 20 MPG | 18 | 24 | $3850 | 443 | 1 |
| 2019 | 23 MPG | 20 | 28 | $3350 | 383 | 2 |
| 2018 | 23 MPG | 20 | 28 | $3350 | 383 | 2 |
| 2017 | 23 MPG | 20 | 28 | $3350 | 383 | 2 |
| 2016 | 21.5 MPG | 19.5 | 26.5 | $3575 | 406 | 2 |
| 2015 | 21.5 MPG | 19.5 | 26.5 | $3575 | 406 | 2 |
| 2014 | 21.5 MPG | 19.5 | 26.5 | $3575 | 408 | 2 |
| 2013 | 21.5 MPG | 19.5 | 26.5 | $3575 | 408 | 2 |
| 2012 | 21 MPG | 18 | 25.5 | $3650 | 423 | 2 |
| 2011 | 21 MPG | 18 | 25.5 | $3650 | 423 | 2 |
| 2010 | 21 MPG | 18 | 25.5 | $3650 | 423 | 2 |
| 2002 | 17.5 MPG | 15 | 21.5 | $4425 | 508 | 2 |
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 Carrera 4 Cabriolet ranks 30 on current figures, against a class average of 22.5 MPG.
Closest more-efficient alternatives in the same class: Porsche Carrera 4 S Cabriolet (20.5), Porsche Carrera 4 S Coupe (20.5), Mitsubishi Eclipse Spyder (21), Porsche 911 Carrera (21), Porsche 911 Carrera Cabriolet (21).
Tailpipe CO₂ is rated at 443 grams per mile, which works out to roughly 6.6 tonnes a year at 15,000 miles.
Questions
What MPG does the Porsche 911 Carrera 4 Cabriolet get?
The 2024 Porsche 911 Carrera 4 Cabriolet is rated at 20 MPG combined by the EPA — 18 city and 24 highway. Across all 16 model years in the database it averages 21 MPG, ranging from 17 to 24 depending on year and trim.
How much does a Porsche 911 Carrera 4 Cabriolet cost in fuel per year?
At 20 MPG and 15,000 miles a year, it burns about 750 gallons — roughly $2400 a year with fuel at $3.20 a gallon, or $0.160 per mile. The EPA's own published annual figure for the 2024 model is $3850.
Has the Porsche 911 Carrera 4 Cabriolet become more efficient over time?
Yes. It has gone from 17.5 MPG in 2002 to 20 in 2024 — an improvement of 2.5 MPG, or 14% across 16 model years.
Is the Porsche 911 Carrera 4 Cabriolet efficient for its class?
It ranks 30 of 68 in the Minicompact Cars class on current figures, against a class average of 22.5 MPG. That is 2.5 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.