The Porsche 718 Cayman S may deliver 345 bhp but its new turbocharged four-cylinder engine is by no means economical with its real-world fuel economy rating.
Having worse fuel economy than the V6-powered Jaguar F-Type, the 718 Cayman S had a combined real world figure of 28.39mpg which is 18.7% less than the 34.9mpg Porsche has on paper. You’d think the change from a six-cylinder engine to a four cylinder would improve fuel economy but it still saw worse numbers than the F-Type. Jaguar’s F-Type had a real world fuel economy figure of 28.79mpg which is 14.3% less than the claimed 33.6mpg.
While this is not as bad as the 718 Cayman S, all that extra fuel used will add up for both vehicles. Both cars were tested along with 20 other models by What Car’s new True MPG process. The tests took place at a NEDC approved testing center and they made sure the Millbrook Proving Ground’s driving conditions were the same for every car tested.
But, we must remember that a car’s fuel economy can change depending on the driver, traffic and road conditions. This point was brought up by a Porsche spokesman; “of course, the real world will present variations based on road conditions and driving styles. It can be higher than the official standard fuel consumption, but also lower if the driver adopts an appropriate driving style.”
At least the 718 Cayman S didn’t perform as bad as the Audi A4 3.0 TDI 218 which saw a shortfall of 36.2% when they compared its real world fuel economy rating (42.0mpg ) to Audi’s official fuel economy of 65.9mpg.