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Porsche's 911 GT2 is the most powerful production 911 in the company's history. The 911 GT2 accelerates to 60 mph in just 3.6 seconds and reaches a top track speed of 204 mph. The Porsche Cayenne Hybrid will cut fuel consumption about 15 percent while retaining its driving dynamics. It will use a gasoline internal-combustion engine and an electric motor that will operate independently or jointly.