Porsche 718 Cayman review - MPG, CO2 and running costs
The benefit of the Cayman's smaller, turbocharged 2.0-litre engine 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.
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 Porsche could save you several hundred pounds at the pumps.
For the basic 718 Cayman, fuel economy is 29.1-31.7mpg, while CO2 emissions of 208-220g/km are pretty good for a performance car. The Cayman S doesn’t fare too badly, either – returning 27.4-29.4mpg and emitting 217-235g/km. Predictably, the more powerful GTS version is less efficient, managing 25.9-28mpg with CO2 emissions from 230g/km. The track-inspired GT4 RS won’t be winning any awards for services to the environment, as it only delivers a claimed average of 21.4mpg, while emitting 299g/km of CO2.
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 44 vs group 46), while the GTS is three grades higher in group 49. Unsurprisingly, the harcore GT4 RS is the priciest to insure as it resides in group 50 (out of 50).
Depreciation
Residual values for the Cayman are strong, although some models perform slightly better than others. The entry 2.0-litre versions should hold onto around 58 per cent of their original value after three-years/36,000-miles of ownership.
The S and GTS models should return 55 to 58 per cent of their showroom price after 36 months of motoring, while the GT4 also holds onto 58 per cent.
