Green credentials

Green credentials
More significantly, the revised S-Class is easier on the planet thanks to engine tweaks and low-rolling-resistance tyres.

The S320 CDI (actually a 3.0-litre diesel) has taken the biggest step forward, because it gets Merc's full Blue Efficiency treatment, which includes aerodynamic aids and an automatic gearbox that decouples when you come to a stop. Average fuel economy rises from 34.0mpg to 37.2mpg, while CO2 emissions fall by enough to drop it five company car tax bands.