Mulsanne has long reigned atop the British automaker’s family of models. But one shouldn’t be fooled by the car’s past as a chauffeured, upstairs-downstairs scenario on wheels. Given the new Mulsanne Speed’s 6 ¾-litre, twin-turbo V8 engine—the 7,000-pound, blue-blooded beast roars from zero to 60 mph in 4.8 seconds, topping ...
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