In-depth reviews

Porsche 718 Cayman review - MPG, CO2 and Running Costs

The benefit of a turbocharger is better fuel economy and lower emissions – although you still have the full-fat, six-cylinder option

While the four-cylinder turbo engines may not please the purists, those that drive their Cayman every day will be grateful for the improvements this new tech brings in the way of lower emissions and better fuel economy. However, under WLTP tests, the official economy figures are poorer than they once were, although you're more likely to hit them in real-world driving.

The benefits aren’t just evident on paper, though. During our time with an entry-level Cayman 2.0, we saw the trip readout hit 39mpg on a longer motorway run. Granted, if you push the car to its limits you won’t come close to such numbers, but if you’re careful, this new Porsche could save you several hundred pounds at the pumps.

For the basic 718 Cayman, fuel economy is 31.4-33.2mpg, while emissions of 186g/km are pretty good for a performance car. The Cayman S doesn’t fare too badly, either – returning 29.1-31.0mpg and emitting 210g/km. Predictably, the more powerful GTS version is less efficient, managing 25.9mpg with CO2 emissions at 246g/km. The track-inspired GT4 won’t be winning any awards for services to the environment, as it only makes 25.7mpg and puts out 249g/km of CO2.

 The smaller-capacity 2.0-litre versions make the Cayman an extremely attractive proposition for company car owners wanting low tax bills but maximum driver enjoyment. One blot on the running costs copybook is that all versions of the 718 Cayman start in excess of £40,000, so private buyers have to pay the additional road tax premium for the first five years of ownership.

Insurance groups

Whichever way you look at it, the 718 Cayman isn’t going to be cheap to insure. The entry-level model sits two insurance groups lower than the S (group 42 vs group 44), while the GTS is two grades higher at group 46. The latest Audi TT RS splits the Cayman and Cayman S  in group 43, and a BMW M2 falls into group 42, despite its higher list price.


Residual values for the Porsche 718 Cayman are predictably high, with every model retaining more than 50 percent of its value after three years. The entry-level Cayman 2.0 is actually the biggest depreciation-buster – holding on to 55.36 per cent of its value, while even a top-spec Cayman S with the PDK gearbox will keep 50.58 per cent. Those numbers are similar to the outgoing Cayman, but better than a BMW M2, which will retain between 46 and 48 per cent of its value after 36 months. Whichever way you look at it, the Cayman will be a relatively cost-effective sports car to run.


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