2009 Porsche Boxster (Automatic 7-spd) MPG & Specs
Quick answer
The 2009 Porsche Boxster gets an EPA-estimated 20/29 MPG (city/highway) and 24 MPG combined, with an estimated $3,150/year fuel cost and 370.292 g/mi CO₂. Engine: 2.9 L 6-cyl.
The 2009 Porsche Boxster with the 2.9-liter 6-cylinder premium gasoline engine returns an EPA-estimated 20 MPG in the city and 29 MPG on the highway, for a combined 24 MPG. This page summarizes the official EPA fuel-economy and emissions data for this configuration.
| Engine | 2.9 L 6-cyl |
| Transmission | Automatic 7-spd |
| Drive | Rear-Wheel Drive |
| Fuel type | Premium Gasoline |
| Vehicle class | Two Seaters |
| MPG — city | 20 |
| MPG — highway | 29 |
| MPG — combined | 24 |
| Annual fuel cost* | $3,150 |
| CO₂ tailpipe | 370.292 g/mi |
| EPA GHG score | — |
How efficient is it?
With a combined 24 MPG, the 2009 Porsche Boxster sits in the moderate range for fuel economy. That is about 19% better than the typical Two Seaters of its era (20 MPG class average), making it one of the more efficient choices in its class.
Fuel economy and running costs
At about $3,150 per year in fuel (EPA estimate, 15,000 mi/yr), fuel is a major part of the cost of owning the 2009 Porsche Boxster. Over five years that is roughly $15,750 at today's prices — before insurance, maintenance, and depreciation.
Emissions
The 2009 Porsche Boxster emits approximately 370.292 grams of CO₂ per mile at the tailpipe. Lower emissions generally track higher fuel economy.
How to read these numbers
EPA figures come from standardized laboratory test cycles and are the same estimates shown on the vehicle's window sticker. Your real-world mileage depends on driving style, conditions, fuel grade, and maintenance. Use combined MPG and annual fuel cost to compare vehicles fairly.