The Porsche 718 Boxster does 22.5 mpg combined (20 city, 25.5 highway), which works out to about $1,707 a year in fuel at $3.20 a gallon and 12,000 miles. Engine choice matters more than you'd think: 2L 4-cyl does 24 mpg while 4L 6-cyl does 21 — a difference of $229 a year. Against other 4-cyl cars it sits below the average of 25.7 mpg.
Every Porsche 718 Boxster engine, compared
Gas mileage on the Porsche 718 Boxster ranges from 24 down to 21 depending on which engine sits under the bonnet — a spread of $229 a year across 2 versions of the same car. Picking the right one often saves more fuel than picking a different car altogether. Yearly cost assumes 12,000 miles at $3.20 a gallon.
| Engine | Combined | City / Highway | Years | Fuel per year |
|---|---|---|---|---|
| 2L 4-cyl | 21 / 27 | 2021–2025 | $1,600 | |
| 4L 6-cyl | 19 / 24 | 2021–2025 | $1,829 |
What that actually costs
The Porsche 718 Boxster burns a gallon every 22.5 miles, so 12,000 miles takes about 533 gallons a year. At $3.20 that is what the table below adds up to.
| Measure | Value |
|---|---|
| Cost per mile | $0.142 |
| Fuel per year | $1,707 |
| Fuel over five years | $8,535 |
| Against other 4-cyl cars | +$213 a year |
| EPA's own estimate | $3,425 a year |
City or highway — who is this car for
The Porsche 718 Boxster gives up 5.5 mpg the moment you leave the motorway — 25.5 out there against 20 in town, a 28% drop worth $414 a year. A wide gap punishes stop-and-start traffic; a narrow one means the car doesn't care where you drive it.
| Measure | Value | Reading |
|---|---|---|
| City | 20 mpg | $1,920 a year if you only drive in town |
| Highway | 25.5 mpg | $1,506 a year if you mostly commute |
| Gap | +5.5 mpg (28%) | Typical for its type |
How the 718 Boxster changed over the years
Combined figure across the 5 model years the 718 Boxster was rated in, all of them at 22.5 mpg. Jumps usually mark a new generation or a new engine; dips often mean a heavier body or added all-wheel drive.
| Model year | Combined | City / Highway | Engines offered | Fuel per year |
|---|---|---|---|---|
| 2025 | 20 / 25.5 | 2 | $1,707 | |
| 2024 | 20 / 25.5 | 2 | $1,707 | |
| 2023 | 20 / 25.5 | 2 | $1,707 | |
| 2022 | 20 / 25.5 | 2 | $1,707 | |
| 2021 | 20 / 25.5 | 2 | $1,707 |
MPG is a number. Dollars per year is the answer.
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How we count
This page rests on 10 EPA ratings of the Porsche 718 Boxster — 2 engines across 2021–2025. The mileage is EPA's laboratory figure, unchanged; the yearly bill is ours, at 12,000 miles and $3.20 a gallon, against EPA's own estimate of $3,425. Full method.
Frequently asked questions
What mpg does the Porsche 718 Boxster get?
22.5 mpg combined on average — 20 in the city and 25.5 on the highway, per EPA ratings across 2021–2025.
How much does a Porsche 718 Boxster cost in fuel per year?
About $1,707 at 12,000 miles and $3.20 a gallon — roughly $8,535 over five years, or 0.142 dollars a mile.
Which 718 Boxster engine is the most economical?
The 2L 4-cyl at 24 mpg, against 21 for the 4L 6-cyl — a difference of about $229 a year.
Is the 718 Boxster good on fuel compared with similar cars?
Against other 4-cyl cars it sits below the average of 25.7 mpg, computed across 4765 ratings.
Are these real-world 718 Boxster figures?
No — they are EPA laboratory ratings, the same ones printed on the window sticker, and EPA's own annual fuel estimate for the Porsche 718 Boxster is $3,425 against the $1,707 we compute at 12,000 miles. Expect a little worse in practice: the spread between the 24 and 21 mpg versions of this car is smaller than the spread between two drivers of the same one.
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