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These variants achieved better economy by weight reduction using a newly developed windscreen made of laminated glass from Maybach saloon, optimised noise-insulating firewall lining, using lightweight forged wheels with low rolling resistance tyres from Michelin, lightweight transmission; reducing drag coefficient to 0.25 via smooth under-body cladding, radiator grille shutter, sealing the joints between the hood and headlamps, as well as between the fender and headlamps, streamlined exterior mirrors housing, lowering the suspension by 15 millimeters, aerodynamically tuned wheels; servo pump shut-off in power steering system; new 6-speed manual transmission with newly developed final drive featuring further-improved anti friction bearings and forged differential gears, longer final-drive ratios (C 180 KOMPRESSOR, C 200 CDI); ECO Training mode cockpit; reduced engine displacement, optimising the combustion chamber, mixture formation and engine friction (C 180 KOMPRESSOR); direct injection with max 200 bar piezoelectric fuel injectors (C 350 CGI BlueEFFICIENCY).
Early models were introduced in Spring 2008, including C 180 KOMPRESSOR BlueEFFICIENCY, C 200 CDI BlueEFFICIENCY, C 350 CGI BlueEFFICIENCY.[30]
C 220 CDI BlueEFFICIENCY, C 250 CDI BlueEFFICIENCY, C 250 CGI BlueEFFICIENCY were introduced in 2009. C 250 CGI BlueEFFICIENCY includes direct injection. All 3 models include choice of sedan or station wagon.[31]
C 180 CGI BlueEFFICIENCY, C 200 CGI BlueEFFICIENCY, C 220 CDI BlueEFFICIENCY, C 250 CDI 4MATIC BlueEFFICIENCY were added in 2010, with C 250 CDI 4MATIC BlueEFFICIENCY and C 220 CDI BlueEFFICIENCY available in autumn 2010. All 4 models include choice of saloon or estate body. ECO start/stop function is included for C 180 CGI BlueEFFICIENCY, C 200 CGI BlueEFFICIENCY, C 220 CDI BlueEFFICIENCY. Direct petrol injection were added for C 180 CGI BlueEFFICIENCY, C 200 CGI BlueEFFICIENCY. C 250 CDI 4MATIC BlueEFFICIENCY includes Electronic Stability Program, traction system 4ETS.
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