[nefarious986]

Quoted from the NY Times.

http://www.nytimes.com/2008/08/03/automobiles/03OCTANE.html?_r=1&no_interstitial&oref=slogin

Porsche, for example, acknowledges that any of its modern production cars can be run on regular fuel without the risk of damage.

A spokesman for Porsche North America, Tony Fouladpour, added a caveat. “If you want the car to perform at its maximum capability, the best choice would not be 87,” he said. “But we do not forbid it.”