The Porsche 918 Spyder hypercar is not sold out yet – but will do so once customers have had a chance to drive it according to the firm’s head of R&D, Wolfgang Hatz.

The £672,000 hypercar, which will launch this September, and feature a V8 hybrid powertrain, featuring two electric motors. Its lithium ion batteries can also be charged from a domestic socket, and the car can drive at high speeds on electric power alone.

Porsche says the 918 Spyder will be able to reach 62mph in 3.2sec and a top speed in excess of 199mph. It will also return 94mpg and emit 70g/km of CO2.

Speaking at the Shanghai motor show, Hatz said: “We have a lot of customers interested in it, but the car is expensive, and that high price point means that many of them want to drive it before they spend their money.

“When the first cars are ready, and the customers can drive them, I am confident we will sell them all. Already we have sold more 918s than we had at the same point in the launch process with the Carrera GT, so we are confident.”

At present, the only 918s running are prototypes. Because of the experimental nature of the cars and the extreme technologies involved, Hatz said he cannot risk sanctioning allowing anyone from outside the company to drive one before the firm builds the first pre-production cars, just prior to its September launch.

Hatz also said it was wrong to compare the 918 Spyder to other hypercars such as the Ferrari LaFerrari and McLaren P1.

“The Porsche 918 is so different,” he said. “A car with more technology on than the 918 you cannot buy. At present, nobody outside our R&D group has experienced a supersports car with more electric power. It drives fast in electric mode, has good range and you can use the electric system to boost the car. This is something unique, and really quite special.”