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At the heart of the 2010 Porsche Panamera Turbo beats a 4.8-liter, twin-turbocharged V8 generating a stout 500 horsepower and 516 pound-feet of torque.When equipped with the optional Sport Chrono package, as ours was, torque is upped to 567 lb-ft when launch control is engaged. The only transmission offered is a seven-speed dual-clutch automated manual that allows for conventional automatic operation or manual control via steering-wheel-mounted switches. Power is routed to all four wheels, with most of it sent to the rear. The EPA estimates Panamera fuel consumption at 15 mpg city/23 mpg highway, but we averaged only 14.7 mpg in combined driving. Restraint was not terribly important to us, as evidenced by one 9.5 mpg tank as we unleashed the Panamera on our favorite mountain roads, but we also managed a 20.6-mpg highway-heavy stint. As for the numbers related to performance, the Panamera Turbo had us picking our collective jaws off the tarmac. Zero to 60 mph in a blisteringly quick 3.7 seconds (3.5 with rollout). The quarter-mile passed in a blur at 12.0 seconds at 111.3 mph. Even though our test vehicle lacked the optional ceramic composite brakes, our Panamera came to a stop from 60 mph in a very short 111 feet, with no sign of fade over several runs. As impressive as the straight-line numbers are, the Panamera Turbo truly left us speechless (unless you count maniacal giggling) during the cornering portion of our tests. At the track, it cleared the slalom at 68.2 mph and pulled 0.92g on the skid pad. But these figures still don't do justice to the Panamera's road-holding abilities. A quick tap of the Sport Plus button lowers the ride height, tightens up the suspension and sharpens the throttle response, allowing the big Porsche to bound between turns like a much smaller sports car. Driven smoothly, the Panamera tracks through corners with surgical precision. Driven enthusiastically, it delivers muscle car frivolity.