2025 Porsche 718 Boxster S MPG & Specs — Real-World vs EPA, All Trims
Every gas trim of this model takes premium.
Is the 2025 Porsche 718 Boxster S good on gas?
At up to 22 MPG combined, the 2025 Porsche 718 Boxster S is better than average for a Two Seaters — that class averages about 19.4 MPG across 2,500 EPA-tested versions, so it's a good pick on fuel for its size.
Real-world MPG vs the EPA number
The EPA figures above come from a standardized dynamometer test, not the open road — real-world MPG typically runs a bit lower depending on your driving, climate and terrain. That's true of every car on this site, old or new.
At today's AAA national average price — $4.68/gal for premium gas as of 2026-07-05 — the most efficient trim runs about $3,191/year (roughly $266/month, about $21.27 per 100 miles) at the EPA's assumed 15,000 miles/year, using an estimated 682 gallons a year. We don't estimate a cost-per-fill since exact tank size isn't in the public EPA dataset, but the per-100-mile figure scales to any tank. Current national average gas prices →
2025 Porsche 718 Boxster S trims & fuel economy
| Trim (engine / transmission) | Fuel | MPG | Fuel/yr (today's price) |
|---|---|---|---|
| 2.5L 4-cyl, AM-S7 automatic, RWD | PREMIUM | 22 | $3,191 |
| 2.5L 4-cyl, 6-spd manual, RWD | PREMIUM | 21 | $3,343 |
2025 Porsche 718 Boxster S specs
What the EPA test-car listings record for this model year — every combination sold is a row in the trims table above.
| Engine options | 2.5L 4-cyl turbo |
| Transmission | AM-S7 automatic · 6-spd manual |
| Drive type | RWD |
| EPA body class | Two Seaters |
| Fuel | Premium |
| Tailpipe CO₂ | 410–423 g/mi |
Other years of the Porsche 718 Boxster S
Similar cars (Two Seaters)
Cars that take premium · Cheapest cars to fuel · Where fuel grade depends on the trim · Fuel guides
2 trim(s) · EPA FuelEconomy.gov data retrieved 2026-07-24 · fuel prices AAA national average as of 2026-07-05.