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2015 Chevy Impala adds start/stop tech

Expanding the use of mileage-enhancing start/stop technology on its 2.5-liter Ecotec 4-cylinder engine, Chevy has confirmed that the full-size 2015 Impala will benefit from this econo tweak on its base engine. Introduced on the 2014 Malibu, Chevy says the new start/stop technology will help boost the EPA city rating on Impalas with the 2.5-liter engine by roughly five percent, from 21 to 22 mpg. The Impala's optional 3.6-liter V6 will not be fitted with the system. 

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GM engineers used knowledge gained from the existing eAssist mild-hybrid system to develop this start/stop package. At its heart is smart control software that ensures the shut down/start up process is as smooth and seamless as possible and to decide under what types of traffic conditions the system should -- or should not -- be activated. The package also includes a larger starter motor to deal with the additional ignition cycles, revised motor mounts for better noise/vibration isolation and a supplemental trunk-mounted battery to power ancillary systems when the engine is shut down. 

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The 2015 Chevrolet Impala lineup will arrive in dealers this summer. Pricing for the 4-cylinder Impala LS will start at $27,735 while the 3.6-liter V6 Impala LT will open at $30,960. 

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