In-depth Reviews

Porsche 718 Cayman coupe - MPG, running costs & CO2

It seems almost alchemy that a car as fast as the Porsche 718 Cayman offers the economy it does

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We’ve already discussed how the Porsche 718 Cayman’s personality suffers slightly due to its turbocharged engines, but it’s only fair to also look in more detail at the advantages this technology brings with it.

Porsche 718 Cayman MPG & CO2

A decade or two ago, cars with the 718 Cayman's performance used to be the preserve of the seriously wealthy. True, at over £40,000, the 718 costs almost twice the average UK buyer's budget for a new car, but if you're in a position to afford and justify the initial outlay, fuel economy and VED tax are comparatively palatable.

The standard 718 Cayman returns up to 31.7mpg and stepping up to the 718 Cayman S sees economy barely drop at all - you won't really notice the difference on the road. The effects of the move to smaller turbocharged engines on efficiency is demonstrated by comparing the economy of the standard Cayman engines with the 4.0-litre six-cylinder engine in the Cayman GTS and GT4; which can only manage around 25mpg, while CO2 emissions rocket to over 245g/km.

Road tax is £150 a year but because every Cayman costs more than £40,000, a £320 surcharge is added in years two to six – making tax £475 a year in that period. If you’re lucky enough to drive a 718 Cayman as a company car, every version sits in the top Benefit-in-Kind band.


One thing that’s likely to cost you dearly if you choose a 718 Cayman is insurance. Cars as fast and desirable as this tend to be – rightly or wrongly – penalised by insurance ratings. The old Cayman sat in groups 37-43 out of 50, while the new 718 Cayman sits in group 42 and the Cayman S is in group 44.


Another unavoidable area of expense here: sports cars use sophisticated parts and require specialist knowledge when being worked on. The good news is that Porsche offers fixed-price servicing and long service intervals, so budgeting should be easy.


All new Porsches come with a three-year/unlimited-mileage warranty. The timeframe of this is nothing to write home about, but the lack of a mileage cap is praiseworthy.

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