2015 Porsche Boxster GTSFuel Economy & MPG Ratings
Gasoline Two SeatersRear-Wheel Drive
City
21
MPG
Highway
30
MPG
Combined
25
MPG
Trim Comparison
Automatic (AM-S7)
Premium
City
21
Hwy
30
Comb
25
Fuel cost: $3,250/yr
Manual 6-spd
Premium
City
19
Hwy
26
Comb
22
Fuel cost: $3,700/yr
| Trim | Engine | City | Hwy | Combined | Fuel Cost/yr |
|---|---|---|---|---|---|
| Automatic (AM-S7) | Premium | 21 | 30 | 25 | $3,250 |
| Manual 6-spd | Premium | 19 | 26 | 22 | $3,700 |
Annual Fuel Cost
$3,250
Based on gasoline at $3.67/gal, 15,000 miles/year
5-Year Fuel Savings
$-4,250
vs. average new vehicle
EPA Fuel Economy Score: 6/10
GHG Score: 6/10
Environment
- CO₂ Tailpipe Emissions
- 359 g/mile
- Annual Petroleum Consumption
- 11.9 barrels
Specifications
- Engine
- 3.4L 6-cyl
- Transmission
- 6-speed Manual
- Drivetrain
- RWD
- Body Style
- Sedan
- GVWR
- Class 1 (≤6,000 lbs)
Source: EPA fuel economy data & NHTSA vPIC. Specifications reflect the most common trim configuration.
Engine & Efficiency Details
Source: EPA fueleconomy.gov
- Engine Size
- 3.4L, 6-cylinder
- Induction Type
- Direct Injection
- Fuel Type
- Premium Gasoline
Annual Fuel Cost by State
Prices as of week ending May 18, 2026 · Source: EIA
National AvgEPA default
$4.490/gal$2,694/yr
California
$5.957/gal$3,574/yr
Texas
$3.888/gal$2,333/yr
Florida
$4.136/gal$2,482/yr
New York
$4.522/gal$2,713/yr
Ohio
$4.510/gal$2,706/yr
Washington
$5.591/gal$3,355/yr
Colorado
$4.618/gal$2,771/yr
Minnesota
$4.344/gal$2,606/yr
Massachusetts
$4.448/gal$2,669/yr
| State | Gas Price | Annual Cost | vs. National Avg |
|---|---|---|---|
| National AvgEPA default | $4.490/gal | $2,694/yr | — |
| California | $5.957/gal | $3,574/yrHIGHEST | +$880 |
| Texas | $3.888/gal | $2,333/yrLOWEST | $-361 |
| Florida | $4.136/gal | $2,482/yr | $-212 |
| New York | $4.522/gal | $2,713/yr | +$19 |
| Ohio | $4.510/gal | $2,706/yr | +$12 |
| Washington | $5.591/gal | $3,355/yr | +$661 |
| Colorado | $4.618/gal | $2,771/yr | +$77 |
| Minnesota | $4.344/gal | $2,606/yr | $-88 |
| Massachusetts | $4.448/gal | $2,669/yr | $-25 |
Calculated at 15,000 miles/year (EPA standard assumption) using 25 MPG combined. Regular gasoline prices. Actual costs vary.
Related
Porsche Boxster GTS MPG History
See how this model's fuel economy changed by year