FuelFacts

2011 Porsche Boxster MPG & Specs — Real-World vs EPA, All Trims

Every gas trim of this model takes premium.

22–23
MPG combined (19–20 city / 26–29 hwy)
$3,052–$3,191
est. fuel / year (today's prices, 15k mi)
Premium
gas type

Is the 2011 Porsche Boxster good on gas?

At up to 23 MPG combined, the 2011 Porsche Boxster 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.

EPA updated its fuel-economy equations again for model year 2017 — mostly affecting hybrids and turbocharged engines — and recalculated 2011-2016 ratings to match, in some cases 1-2 MPG lower. The number above already reflects that update.

At today's AAA national average price — $4.68/gal for premium gas as of 2026-07-05 — the most efficient trim runs about $3,052/year (roughly $254/month, about $20.35 per 100 miles) at the EPA's assumed 15,000 miles/year, using an estimated 652 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 →

2011 Porsche Boxster trims & fuel economy

Trim (engine / transmission)FuelMPGFuel/yr (today's price)
2.9L 6-cyl, Automatic 7-spd, RWDPREMIUM23$3,052
2.9L 6-cyl, 6-spd manual, RWDPREMIUM22$3,191
Where the EPA lists premium, that’s the fuel the maker specified for the mileage test — many such engines run on regular with slightly less power/MPG. Whether premium is required or just recommended is an owner’s-manual detail the EPA dataset omits, so we don’t guess it.

2011 Porsche Boxster specs

What the EPA test-car listings record for this model year — every combination sold is a row in the trims table above.

Engine options2.9L 6-cyl
TransmissionAutomatic 7-spd · 6-spd manual
Drive typeRWD
EPA body classTwo Seaters
FuelPremium

Other years of the Porsche Boxster

2015 Porsche Boxster2014 Porsche Boxster2013 Porsche Boxster2012 Porsche Boxster2010 Porsche Boxster2009 Porsche Boxster2008 Porsche Boxster2007 Porsche Boxster

Similar cars (Two Seaters)

2011 smart fortwo electric drive cabriolet2011 Lotus Elise/Exige2011 Spyker C8 Aileron2011 Ferrari 599 GTB Fiorano2011 Ferrari 599 GTO2011 Ferrari 599 SA Aperta

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.