Porsche Boxster roadster (2012-2016) - MPG, running costs & CO2

Fuel economy is relatively good but parts and servicing aren't cheap

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The standard Boxster is relatively reasonable on fuel for a sports car, however moving up the range gets you more power but increasingly worse economy. Insuring the car won’t be cheap, and neither will servicing it or replacing consumables such as tyres and brake pads – particularly if you drive it enthusiastically on a regular basis.

Porsche Boxster MPG and CO2

There are four Porsche Boxster models, each with a different power output. The entry-level Boxster has a 2.7-litre petrol engine and returns 34.4mpg with CO2 emissions of 192 grams per kilometre for annual road tax of £265. Considering the performance on offer, those figures are pretty good.

The Boxster S has a larger 3.4-litre petrol engine that’s capable of 32.1mpg and emits 206g/km of CO2 for an annual tax bill of £290. The Boxster GTS uses a more powerful version of the same engine, so economy slips slightly to 31.4mpg. CO2 emissions of 211g/km keep it in the same tax bracket as the S model.

The Boxster Spyder is the fastest, most extreme version of the car and is powered by the 3.8-litre petrol engine used in the iconic Porsche 911. It produces 370bhp, but it’s easily the least frugal model in the range. It’ll do 28.5mpg and its CO2 emissions of 230g/km leave you on the hook for road tax of £490 a year.

Insurance groups

The standard Boxster falls into insurance group 40, while the more powerful S version is in group 43. The GTS model is more powerful still, so it’s in group 44. The performance on offer from the Boxster Spyder puts it in the top group 50.


A combination of Porsche’s ‘premium’ brand image, the technology used in its cars and the quality of components fitted to them means they’re never cheap to service. Consumables like tyres and brake pads will cost a lot to replace and if you drive the car hard often, you’ll wear through these fairly regularly.

A minor service for a Boxster will cost you around £480, with a major service priced at £610. A minor service is due after two years or 20,000 miles, while a major is due every four years or 40,000 miles.


All new Porsches come with a three-year/unlimited-mileage warranty. There’s also an extended warranty you can buy at the end of the three years if you wish. Porsche provides roadside assistance across Europe to UK buyers for the first three years of the car’s life, too.

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