Mercedes-Benz S 350 BlueTEC is now fitted with ECO start/stop as standard making it even more efficient than before. To be more precise – 10%, which means 45.6 mpg on the combined cycle while CO2 emissions have been reduced by 7% to 164 g/km.
So, the S 350 BlueTEC is the first model, which meets EU 6 regulations, which will come into effect in the UK until 2014.
S 350 BlueTEC is powered by a 3.0 liter V6 diesel with hefty 258PS (190 kW) and 620Nm of torque. 0 to 60 mph in 7.1 seconds and has a limited top speed of 250 km/h (155 mph).
“The Mercedes still reigns supreme…what sets it apart is the astonishingly comfortable ride, it is the most relaxing saloon in the business. Nothing can match the S-Class’s imperious refinement and the array of gadgets help make this car one of the safest and most hi-tech models money can buy,” commented Auto Express, Acting Editor, Graham Hope.
In addition to its BlueTEC technology, the S 350 BlueTEC also enjoys the full benefits of Mercedes-Benz innovative range of bespoke BlueEFFICIENCY economy-boosting measures.
The S 350 BlueTEC rides on low rolling resistance tires having a 10% improvement, while still retaining good handling and braking characteristics.
The vehicle also comes with a smooth under body panelling, allowing the car to cleave cleanly through the air at speed thanks to reduced aerodynamic drag and lower wind resistance.
Source: Mercedes-Benz
Mercedes has exclusively announced that its 2010-premiered Mercedes-Benz S 350 BlueTEC now packs an ECO start/stop function as standard. 
Brabus, the German tuner renowned for its extremely powerful and well looking Mercedes conversions has unveiled the world’s first tuned ride that fully complies with the new EURO VI emission standard. Fitted with the BRABUS ECO PowerXtra D6S performance pack, the Mercedes S 350 BlueTEC produces the amazing 313 horsepower (230 kW) at a low 3,600 revolutions and 690 Nm (509 lb-ft) of peak torque. 
Mercedes has released the 2010 Mercedes-Benz S 350 BlueTEC, announcing it the most efficient and safest S-Class ever.