The BlueEFFICIENCY version of the 136hp (100kW) C200 CDI consumes just 5.1L of diesel per 100km, while the C180 BlueEFFICIENCY with 156hp (115 kW) needs just 6.5L of petrol per 100km. This represents a 12% reduction in fuel consumption over the standard models and corresponds to 135 and 156 grams of carbon dioxide, respectively, per kilometre. The third BlueEFFICIENCY C-Class model is the C 350 CGI with direct petrol injection, which burns around 10% less fuel than the standard C350.
To achieve the savings in fuel consumption, engineers reduced the weight of the cars, improved aerodynamic drag and rolling resistance yet and organized the onboard energy management systems more efficiently. The weight savings range between 19 and 32kg and are due in part to a newly developed windscreen made of laminated glass, lighter insulating material and forged alloy wheels.
Other fuel saving measures include the addition of low-rolling resistance tires from Michelin and aerodynamic mods including smooth underbody cladding, a new radiator grille and sealed joins between the bonnet, bumper and headlamps. The car’s suspension has also been lowered by about 15mm.