Jaguar had already achieved what was, we thought, darn close to the perfect grand-touring coupe, with the current-generation Jaguar XK that was introduced for 2007. But they just made it even better for 2010. Most notably, Jag has fitted its new 5.0-liter V-8 to the XK; it makes 385 horsepower at a high-revving 6500 rpm, along with 380 pound-feet...[

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