In-depth Reviews

Porsche Cayenne SUV - MPG, running costs & CO2

High performance inevitably means high running costs. The Porsche Cayenne has strong residuals, though.

Carbuyer Rating

3.9 out of 5

MPG, running costs & CO2 Rating

2.0 out of 5

With huge power and considerable weight, high-performance SUVs typically cost a small fortune to run, and the latest Cayenne is unlikely to be different. Aside from the obvious expense of fuel, regular maintenance and consumable parts will be costly to keep on top of – and most drivers will find it expensive to insure. At least hybrid versions are now available, cutting the cost of fuel and emissions-related tax, particularly for business drivers.

Previous models have also been sought-after on the used market and the third generation is likely to fare no worse, although it's worth noting that the entry-level models tend to hold onto a greater proportion of their value three years on.

Porsche Cayenne MPG & CO2

Porsche is one of several companies to have turned their back on diesel engines. The Cayenne e-Hybrid plug-in model is the fuel-economy hero of the range, capable of up to 72.4mpg, while emitting 89g/km of CO2 from its tailpipes.

Of the pure petrol models, the entry-level, single-turbo 3.0-litre V6 Cayenne is the most economical, with 24.1mpg claimed, while its more powerful 2.9-litre twin-turbo Cayenne S sister is predictably worse, but only slightly, at 23.9mpg.

The Cayenne Turbo promises to return up to just 20.8mpg, slightly less than the 21mpg of the Cayenne GTS, despite the Turbo's extra power. If you're lucky enough to run one as a company car, you'll face the maximum Benefit-in-Kind (BiK) tax rating on all Cayennes bar the e-Hybrid, but with CO2 emissions of over 300g/km, the GTS and Turbo are by far the most polluting.

Every Cayenne costs more than £40,000, so each one incurs a £325 tax surcharge. This means petrol versions cost £475 in yearly VED tax in years two to six, at which point the annual charge will fall to £150. Hybrid versions cost £10 less each year.


Range-topping Cayennes are rated in insurance group 50, while the Cayenne S occupies group 48. The lowest insurance group you can expect is 44, which applies to the entry-level petrol model. As always, we strongly recommend you seek an insurance quote before agreeing to a new car purchase.


Porsche Cayenne service intervals are relatively straightforward, with a yearly oil service required, a minor service after two years or 20,000 miles and a major service every four years or 40,000 miles. Service costs vary by model, but range from around £450 for a minor service to £600 for a major. There may be further costs, though, if additional parts are found to need replacement.

Bear in mind that other maintenance costs will be steep. Consumable items such as brake discs and pads are pricey to replace, and new tyres won't come cheap, either, especially when the biggest wheels are fitted.


Porsche provides UK customers with a three-year/unlimited-mileage warranty that includes European breakdown cover. You can also choose to add a Porsche Approved warranty at any time while your original warranty is in place, although you have to pay for a 111-point inspection if you choose the warranty extension outside the first year of ownership.

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