Daimler announced today that will add two fuel efficient models to their lineup. These are the Mercedes E 200 CDI BlueEFFICIENCY and the Mercedes E200 CGI BlueEFFICIENCY. Both models will have 4-cylinder engines under the bonnet and will come equipped with a 6-speed manual transmission as standard.
The Mercedes E 200 CDI BlueEFFICIENCY is powered by a 2.0-litre engine that can develop 136 hp  (100 kW) needing only 5.2 to 5.5 litres of diesel to cover 100 kilometres. CO2 emission levels are between 137 – 145 g/km and accelerating from 0 to 100 km/h takes 10.2 seconds while top speed is clocked at 210 km/h.
The petrol burning Mercedes E200 CGI BlueEFFICIENCY comes with a 1.8-litre engine that outputs 184 hp (135 kW) consuming 7.2-litres of fuel per 100 kilometres and releasing 169 grams of CO2/Km. Reaching the 100 Km/h mark from a standstill takes 8.5 seconds.
The Mercedes E 200 CDI BlueEFFICIENCY price starts at 38,734 Euros while the E 200 CGI BlueEFFICIENCY price starts at 39,508 Euros. Both versions will hit the market this year in September.
Mercedes press release : 
Mercedes-Benz is adding to the engine line-up for the new E-Class by introducing two economical four-cylinder models. The E 200 CDI  BlueEFFICIENCY developing 100 kW/136 hp consumes 5.2 litres of diesel per 100 kilometres, while the new E 200 CGI BlueEFFICIENCY has an output of 135 kW/184 hp
and consumes 7.2 litres of petrol per 100 kilometres.
Sophisticated, efficient four-cylinder engines make for lower fuel consumption and less environmental pollution without having to compromise on classic Mercedes attributes such as ride comfort and driving enjoyment. As shown by two new E-Class models, which Mercedes-Benz is introducing to complete its engine line-up in the executive category.
The diesel powerplant in the E 200 CDI BlueEFFICIENCY has a displacement of 2143 cc, an output of 100 kW/136 hp, and consumes 5.2 to 5.5 litres of diesel per 100 kilometres (CO2 emissions: 137 – 145 g/km), enabling the Saloon to accelerate from zero to 100 km/h in 10.2 seconds and reach a top speed of 210 km/h.
The petrol engine in the new E 200 CGI BlueEFFICIENCY boasts a displacement of 1.8 litres and an output of 135 kW/184 hp. It takes 8.5 seconds to accelerate from zero to 100 km/h and has a top speed of 232 km/h. This model consumes 7.2 litres of premium unleaded petrol (RON 95) per 100 kilometres (CO2 emissions: 169 g/km), not least thanks to the ECO start/stop function, which is fitted as standard in conjunction with the six-speed manual transmission.
These are all-new four-cylinder powerplants with direct injection. One of the main features of the new diesel engine is latest-generation common-rail direct injection. The likewise new four-cylinder petrol engine with direct injection is fitted with a turbocharger as well as adjustable intake and exhaust camshafts.
The key technical data
Cyl.  Displace-ment  kW/hp  Nm  0-100 km/h  Max. km/h  l/100 km  CO2/km 
E 200 CDI
BlueEFFICIENCY  4  2143 cc  100/136  360  10.2  210  5.2-5.5  137-145 g 
E 200 CGI
BlueEFFICIENCY  4  1796 cc  135/184  270  8.5  232  7.2  169 g 
All figures refer to six-speed manual model
Like all the other engine variants for the new E-Class, which have already been awarded the Environment Certificate by TÜV Süd (Technical Inspection Authority in southern Germany), the two new powerplants comply with the EU5 limits.
Other key attributes of the world’s best-selling luxury saloon, alongside its exceptionally ecofriendly design, include a unique combination of driver assistance systems, such as drowsiness detection, Adaptive Highbeam Assist and automatic emergency braking, which can help to prevent accidents. Further classic E-Class hallmarks include a high level of long-distance comfort, high-quality interior materials, build quality displaying unerring attention to detail and perfect ergonomics.
Prices for the E 200 CDI BlueEFFICIENCY start at € 38,734.50, while those for the E 200 CGI BlueEFFICIENCY start at € 39,508. The market launch is expected in September 2009.

Source: Mercedes