EPA ratings · 2021 · Porsche · 718
2021 Porsche 718 Fuel Economy
EPA rates the 2021 Porsche 718's 20 trims from 19 to 24 MPG combined, 718 Boxster GTS to 718 Boxster. The table below prices every trim per mile at a fuel price and mileage you can change.
EPA ratings by trim
| Trim | Engine | Transmission | Drive | City | Hwy | Combined |
|---|---|---|---|---|---|---|
| 718 Boxster · Premium | 2 L, 4 cyl | Manual 6-spd | Rear-Wheel Drive | 20 | 26 | 22 MPG |
| 718 Boxster · Premium | 2 L, 4 cyl | Automatic (AM-S7) | Rear-Wheel Drive | 21 | 27 | 24 MPG |
| 718 Boxster GTS · Premium | 4 L, 6 cyl | Manual 6-spd | Rear-Wheel Drive | 17 | 24 | 19 MPG |
| 718 Boxster GTS · Premium | 4 L, 6 cyl | Automatic (AM-S7) | Rear-Wheel Drive | 19 | 24 | 21 MPG |
| 718 Boxster S · Premium | 2.5 L, 4 cyl | Manual 6-spd | Rear-Wheel Drive | 19 | 24 | 21 MPG |
| 718 Boxster S · Premium | 2.5 L, 4 cyl | Automatic (AM-S7) | Rear-Wheel Drive | 19 | 25 | 22 MPG |
| 718 Boxster T · Premium | 2 L, 4 cyl | Manual 6-spd | Rear-Wheel Drive | 20 | 26 | 22 MPG |
| 718 Boxster T · Premium | 2 L, 4 cyl | Automatic (AM-S7) | Rear-Wheel Drive | 21 | 27 | 23 MPG |
| 718 Cayman · Premium | 2 L, 4 cyl | Manual 6-spd | Rear-Wheel Drive | 20 | 26 | 22 MPG |
| 718 Cayman · Premium | 2 L, 4 cyl | Automatic (AM-S7) | Rear-Wheel Drive | 21 | 27 | 24 MPG |
| 718 Cayman GT4 · Premium | 4 L, 6 cyl | Manual 6-spd | Rear-Wheel Drive | 17 | 23 | 19 MPG |
| 718 Cayman GT4 · Premium | 4 L, 6 cyl | Automatic (AM-S7) | Rear-Wheel Drive | 18 | 24 | 20 MPG |
| 718 Cayman GTS · Premium | 4 L, 6 cyl | Manual 6-spd | Rear-Wheel Drive | 17 | 24 | 19 MPG |
| 718 Cayman GTS · Premium | 4 L, 6 cyl | Automatic (AM-S7) | Rear-Wheel Drive | 19 | 24 | 21 MPG |
| 718 Cayman S · Premium | 2.5 L, 4 cyl | Manual 6-spd | Rear-Wheel Drive | 19 | 24 | 21 MPG |
| 718 Cayman S · Premium | 2.5 L, 4 cyl | Automatic (AM-S7) | Rear-Wheel Drive | 19 | 25 | 22 MPG |
| 718 Cayman T · Premium | 2 L, 4 cyl | Manual 6-spd | Rear-Wheel Drive | 20 | 26 | 22 MPG |
| 718 Cayman T · Premium | 2 L, 4 cyl | Automatic (AM-S7) | Rear-Wheel Drive | 21 | 27 | 23 MPG |
| 718 Spyder · Premium | 4 L, 6 cyl | Manual 6-spd | Rear-Wheel Drive | 17 | 23 | 19 MPG |
| 718 Spyder · Premium | 4 L, 6 cyl | Automatic (AM-S7) | Rear-Wheel Drive | 18 | 24 | 20 MPG |
City and highway are EPA's adjusted label figures; combined is the 55/45 blend printed on the window sticker. For electric and plug-in trims the MPG columns are MPGe, and the kWh per 100 miles is the figure a charging cost actually turns on; EPA measures it at the wall, so charging losses are already in it. Unrounded combined figures, where EPA publishes them: 718 Boxster 22.4893; 718 Boxster 23.6109; 718 Boxster GTS 19.1; 718 Boxster GTS 21.1; 718 Boxster S 20.9619; 718 Boxster S 21.6084; 718 Boxster T 22.4893; 718 Boxster T 23.2979; 718 Cayman 22.4893; 718 Cayman 23.6109; 718 Cayman GT4 19.2; 718 Cayman GT4 20.3; 718 Cayman GTS 19.1; 718 Cayman GTS 21.1; 718 Cayman S 20.9619; 718 Cayman S 21.6084; 718 Cayman T 22.4893; 718 Cayman T 23.2979; 718 Spyder 19.2; 718 Spyder 20.3.
What the rating costs per mile
The rating divided by a price, times your miles. It starts at EIA's current U.S. averages and EPA's 15,000 miles so the right-hand column is comparable; type your own pump price, home rate and mileage over them.
| Trim | Runs on | Rated | Per mile | Per year | EPA's figure |
|---|---|---|---|---|---|
| 718 Boxster | Premium Gasoline | 22 MPG | 19.5¢ | $2,921 | $3,750 |
| 718 Boxster | Premium Gasoline | 24 MPG | 17.8¢ | $2,678 | $3,400 |
| 718 Boxster GTS | Premium Gasoline | 19 MPG | 22.5¢ | $3,382 | $4,350 |
| 718 Boxster GTS | Premium Gasoline | 21 MPG | 20.4¢ | $3,060 | $3,900 |
| 718 Boxster S | Premium Gasoline | 21 MPG | 20.4¢ | $3,060 | $3,900 |
| 718 Boxster S | Premium Gasoline | 22 MPG | 19.5¢ | $2,921 | $3,750 |
| 718 Boxster T | Premium Gasoline | 22 MPG | 19.5¢ | $2,921 | $3,750 |
| 718 Boxster T | Premium Gasoline | 23 MPG | 18.6¢ | $2,794 | $3,550 |
| 718 Cayman | Premium Gasoline | 22 MPG | 19.5¢ | $2,921 | $3,750 |
| 718 Cayman | Premium Gasoline | 24 MPG | 17.8¢ | $2,678 | $3,400 |
| 718 Cayman GT4 | Premium Gasoline | 19 MPG | 22.5¢ | $3,382 | $4,350 |
| 718 Cayman GT4 | Premium Gasoline | 20 MPG | 21.4¢ | $3,213 | $4,100 |
| 718 Cayman GTS | Premium Gasoline | 19 MPG | 22.5¢ | $3,382 | $4,350 |
| 718 Cayman GTS | Premium Gasoline | 21 MPG | 20.4¢ | $3,060 | $3,900 |
| 718 Cayman S | Premium Gasoline | 21 MPG | 20.4¢ | $3,060 | $3,900 |
| 718 Cayman S | Premium Gasoline | 22 MPG | 19.5¢ | $2,921 | $3,750 |
| 718 Cayman T | Premium Gasoline | 22 MPG | 19.5¢ | $2,921 | $3,750 |
| 718 Cayman T | Premium Gasoline | 23 MPG | 18.6¢ | $2,794 | $3,550 |
| 718 Spyder | Premium Gasoline | 19 MPG | 22.5¢ | $3,382 | $4,350 |
| 718 Spyder | Premium Gasoline | 20 MPG | 21.4¢ | $3,213 | $4,100 |
Per mile = price ÷ rated MPG (gasoline) or price per kWh × kWh per 100 miles ÷ 100 (electricity). Per year = per mile × miles. EPA's figure is its own annual fuel cost at 15,000 miles, 55% city, and the national price in force when the file was built; it will differ from the middle columns whenever the price here differs. A plug-in hybrid is shown once on each fuel; its real cost sits between them, by how much of its driving is on the battery.
Fuel only — before depreciation, insurance, maintenance or tires, which the True Cost per Mile Calculator adds. Most drivers land below the rating; the True MPG Calculator measures your own from two fill-ups.
EPA's own figures, and why they differ
The “EPA's figure” column is EPA's annual fuel cost from the same file: 15,000 miles, 55% city, and the national fuel price fueleconomy.gov was using on the day the file was built (2026-09-29). fueleconomy.gov recomputes its page every week at the current price, so its number and the file's drift apart between file dates; the middle columns here use a price you can see and change, which is the only honest way to compare two cars. EPA also prints a five-year “you save/spend” against the average new vehicle (spends $5,000 for the 718 Boxster); it rests on the same assumptions and is not repeated here as a result.
Every figure on this page is a rating, not a measurement of any particular car. The site never calls a rating wrong; it shows what your own price and miles do to it. See the model on fueleconomy.gov.
Other model years of the Porsche 718: 2025, 2024, 2023, 2022, 2020.
Related tools
Price the same miles on gasoline and on electricity, using your fuel price, your utility rate, and each car's rated efficiency.
Open tool →True MPG CalculatorYour car's real fuel economy from two odometer readings and a fill-up — and how far it falls from its EPA rating.
Open tool →Commute Cost CalculatorWhat getting to work costs per day, per month, and per year — energy only, or all-in at the IRS standard mileage rate.
Open tool →Gas Prices by Region and StateThis week's average price of regular gasoline for the U.S., every state and ten cities, from EIA's weekly survey — a dated figure to start from, never one assumed for you.
Open tool →Electricity Prices by StateThe average residential price of electricity in every state, by month, from EIA's utility filings — and what each rate does to a mile in an electric car.
Open tool →Informational only — published averages for scale and comparison, not a quote for any pump, utility or vehicle. Your own price is the one that counts, and every calculator on this site takes it as an input.
Ratings: U.S. EPA and U.S. DOE, fueleconomy.gov vehicles.csv dated 2026-09-29 (EPA record ids 43216, 43217, 43580, 43581, 43220, 43221, 43224, 43225, 43218, 43219, 43586, 43587, 43584, 43585, 43222, 43223, 43226, 43227, 43582, 43583). Prices: EIA, U.S. regular gasoline week of October 19, 2026; U.S. residential electricity August 2026. Snapshots refreshed monthly.