Bentley on Tuesday filled in some of the blanks on its 2011 Mulsanne flagship at the 2009 Frankfurt Auto Show. But up in the air are such critical details as final U.S. pricing and fuel-economy numbers. The Mulsanne made a showy debut last month at the Pebble Beach Concours d'Elegance. As promised, Bentley in Frankfurt released a raft of technical specifications on the car. The V8 engine, an update of the existing motor that includes cylinder deactivation, displaces 6.75 liters and is mated to an eight-speed transmission. The engine churns out 505 horsepower and 752 pound-feet of torque. 2009 Frankfurt Auto Show: 2011 Bentley Mulsanne: http://www.edmunds.com/insideline/autoshows/frankfurt/2009/more2011bentleymulsannedetailsrevealed.html