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BMW has put up a video that does a decent job of explaining the technology that comprises their EfficientDynamics branding. The first model to get EfficientDynamics is the newly revised 120 model, which gets a start-stop system and some rudimentary regenerative braking capability. The host talks to BMW spokesman Chris Koenders at the recent Geneva Motor Show and they step through the different elements of the system.
[Source: BMW, thanks to Linton for the tip]