The main purpose of Porsche downsizing the previous Cayman’s flat-six engines to turbo fours was to reduce emissions in the wake of tightening CO2 regulations. As such, on paper at least, the mpg figure of up to 40.1 for a PDK Cayman (38.7 for the ‘S’) has been a useful improvement.
However as our team has found, real world economy is not obviously better than the old car’s, with the turbocharged engines consuming considerably more in reality than the unrealistic European test cycles suggest. If you are after a manual, MPG figures will drop further thanks to the loss of a seventh gear.
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That said in context against rivals, the 718’s overall consumption is still very good, and as such it’s still the pick of the sports car bunch when it comes to overall running costs.