Porsche says that it has almost 900 potential buyers for its new 918 Spyder, a plug-in hybrid open-top supercar with a mid-mounted V8. Porsche will probably decide to build the model once 1,000 potential customers have pledged interest, Porsche’s development chief, Wolfgang Duerheimer, said in an interview at the 2010 Beijing Motor Show.

“I’m confident that we will soon reach the threshold of 1,000,” he said in an interview with Bloomberg. “We need 1,000 seriously interested people to make a sound business case.”

“We’re very optimistic that we’ll be able to further expand our leading position in the sports-car segment,” he said.

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