With the introduction of all-new ECO models, the A 180 CDI ECO SE and B 180 CDI ECO SE, Mercedes-Benz UK now offers even better economy, with CO2 emissions from just 92 g/km.

The ECO SE vehicles, available from January 2014 production, both feature weight-saving measures, powertrain refinements, improved fuel consumption with no impact on performance, and improved aerodynamics, with the A 180 CDI ECO SE offering a class-leading coefficient drag of 0.26.

These practical changes include the use of an aerodynamic grille element, coupled with underbody panelling and lowered suspension (-10 mm front and 15 mm rear for A-Class, and 20 mm at the front and 15 mm at the rear for B-Class).

Both vehicles feature manual transmissions with longer ratios in the higher gears, an improved energy recuperation system and make use of a lightweight fuel tank to save on weight.

Replacing the current A 180 CDI SE and B 180 CDI SE manual variants, CO2 emissions on the A 180 CDI ECO SE have been reduced by six per cent to 92 g/km, with combined fuel consumption increased to 78.5 mpg, compared with 74.3 mpg on the outgoing model. B 180 CDI ECO SE emissions have also reduced to 98 g/km CO2, a reduction of nine per cent, with the combined mpg increasing by eight per cent to 74.3 mpg. Despite the focus on economy, for both models the power, torque, top speed and 0-60 mph acceleration, remains unchanged.

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Both vehicles are free from road tax and the Benefit In Kind company car tax band for the A-Class is just 13 per cent, with qualification for 100 per cent capital allowance until 2015.

In addition to the new ECO SE models, the advanced four-wheel drive system first seen on the CLA 250 4MATIC, comes also comes to the A- and B-Class from January 2014.

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4MATIC all-wheel drive ensures optimum traction and driving dynamics in all road conditions, with torque ideally distributed between front and rear axles by an electro-hydraulically controlled multi-disc clutch with variable torque distribution, which allows as much as 50 per cent of power to be sent to the rear wheels.

The A 250 4MATIC is available in both AMG Sport and Engineered by AMG trim, with the B 220 4MATIC exclusively in Sport trim.

Source: Mercedes-Benz