► Who makes the world's best V12 limousine? ► We test Merc S600 vs Rolls Ghost SII vs Bentley Flying Spur At a glance, these lavishly equipped ultra-luxury chariots are aiming their mighty trademark radiator grilles at exactly the same lucrative niche in the market. In reality, however, they differ dramatically in approach, ambience and appeal. The Bentley Flying Spur is an old-school five-seater sports car which fuses a finely trimmed grandfather interior with a high-performance chassis and drivetrain. The Mercedes S600 looks no different to a dressed up S300, but its sophisticated specification reads like a summary of The Technology Bible. The Rolls-Royce Ghost S2 combines the presence of a self-conscious status symbol with the dynamic talents of a properly engineered plaything. One thing, however, they all have in common: synchronologically suicidal fuel gauges, proving once again that weight, drag and a heavy right foot are the arch-enemies of efficiency. Despite a re...