IIRC it's the so-called BAS-Hybrid, which has a higher-voltage alternator and two starters. One of these starters is actually meant to work as a traction motor and assist the gasser engine, thus the system is currently named eAssist.
Quote:
Originally Posted by Gasoline Fumes
I don't know about the Impala, but both the VW Golf and Volvo V40 I drove in Finland didn't shut off until fully stopped.
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Shutting off while decelerating could become potentially dangerous, and increase brake wear as it wouldn't allow engine-braking while driving downhill.