Parkers overall rating: 4.6 out of 5 4.6

Miles per pound (mpp) Miles per pound (mpp)

Petrol engines 5.5 - 7.1 mpp
Low figures relate to the least economical version; high to the most economical. Based on WLTP combined fuel economy for versions of this car made since September 2017 only, and typical current fuel or electricity costs.

Fuel economy

Petrol engines 25.7 - 33.2 mpg
  • Relatively high CO2 ramps up tax
  • Maintenance costs won’t be cheap
  • But two-year service intervals welcome

Let’s not beat around the bush: the Porsche 718 Cayman is not going to be a cheap car to run. But for a car of this type and pedigree, it needn’t break the bank, either. And anyone who can afford the £40k+ price tag won’t baulk at the cost of running this two-seater.

Although CO2 emissions are lower than the six-cylinder era Cayman, they still range from 168-184g/km, meaning that benefit-in-kind taxation and annual VED road tax won’t be insignificant at a time when many family cars are dipping below 100g/km.

Balance tax costs with the fact that all Porsches require servicing only every two years or 20,000 miles, bringing welcome relief from big bills on a regular basis. However, Porsche dealerships aren’t renowned for being cheap to use – you can expect hefty charges for consumables such as tyres, brake pads and exhausts, so make sure you factor those into your budgeting.

The latest 718 Cayman is the cleanest yet – on paper. Those shrunken four-cylinder engines reap dividends at the pumps, with all models now averaging at least 35mpg on the official government fuel economy tests. The smaller-engined entry model is capable of 38mpg according to official figures.

CO2 emissions fall correspondingly. The standard Cayman emits 168g/km, while the S puts out 184g/km.

In the real world, we found ourselves averaging closer to 30mpg, although you’ll see high 30s if you pootle. The flipside? Enjoy a fast blast and fuel economy will quickly sink to the 20s, if not lower.

Is it reliable?

  • Proven platform, few known faults
  • Recall history is good on Cayman
  • New 4-cyl engines still to be proven

The Cayman has been around in one form or another since 2006 and has established a strong reputation for reliability with few known mechanical problems. Earlier issues, such as “trunk clunk” - when the tailgate would rattle over bumps in the road - have largely been ironed out.

First-generation Cayman models were at risk of bore scoring and failed IMS bearings, but an analysis among Porsche experts reveals the risk of a shattered six-cylinder engine was lower than the paranoid fear factor you may detect in internet chatrooms.

However, it is true to say that the new four-cylinder engines are too new to assess for mechanical integrity at this point. Parkers will update this section as we receive more intelligence from owners and the trade. Don’t forget to check out our Cayman owners’ reviews here.

Ongoing running costs

Road tax (12 months) £205 - £475
See tax rates for all versions
Insurance group 42 - 48
How much is it to insure?