We've already seen a BlueEfficiency C-Class model in the shape of the limited edition C 250 CDI, but now there is a mainstream economy C-Class, the C 180 Kompressor BlueEfficiency. Replacing the C 180 Kompressor, it has lower CO₂ emissions, improved economy and a reduced on-the-road price.

Thanks to cutting weight, reducing aerodynamic drag and improving energy management fuel economy has been improved by 11%. Mercedes claims the new manual C 180 will return 44.8mpg on the combined cycle, which equates to an 18g/km reduction in carbon dioxide emissions. Now rated at 149g/km, the BlueEfficiency falls into VED band C rather than band E for the old model. Company car drivers will also find this model a cost-effective choice as it sits in the lower 17% tax band.

The engine is slightly smaller at 1.6-litres but power output is identical to the old model at 154bhp. Although the BlueEfficiency is not about performance, with the same power, less weight and reduced drag the new model should be a little swifter. The claimed 0-62mph time has not changed much at about 9.5 seconds for the manual car but top speed has improved by 5mph to 143mph.

The measures used to achieve the economy boost include smaller door mirrors and low rolling resistance tyres as well as intelligent power management. Power consuming accessories such as the power steering pump are only run when necessary.

The list price for the BlueEfficiency model is the same as the outgoing C 180 Kompressor but the on-the-road price has fallen thanks to lower emissions-related taxes. In saloon form it will set you back £23,350 or £24,757 for the estate and the C 180 Kompressor BlueEfficiency SE (to give it its full title) is on sale now.

John Lambert - 26 Nov 2008