The Range Rover is a heavy old thing. On the positive side, its 6724lbs. GVWR exempts the SUV from US luxury tax. On the negative side, it's on-road performance will not trouble an eight-cylinder BMW X5 or Porsche Cayenne. So it's no suprise that Land Rover has slotted sister Jag's supercharged V8 into its top-of-the-line Range Rover. Auto Express reports that peak power rises from 282 to 400hp, while fuel efficiency sinks to single digits. More importantly, the test pilot Piers Ward says the British 4X4 still "doesn't feel as fast as it should— although it makes the naturally aspirated V8 seem slow." Bugger.