Chevrolet has announced it will make stop/start technology standard on the 2015 Impala full-size sedan equipped with the base 2.5-liter four cylinder engine, improving the vehicle’s fuel economy by nearly 5 percent, or roughly one mile per gallon.
The Impala follows in the footsteps of the Malibu, which also received standard start/stop technology late last year. The system shuts down the engine when it would normally be needlessly idling and kicks it back on when the driver presses the gas. The technology is becoming increasingly more widespread and General Motors believes sales of start/stop equipped vehicles should rise from 8.8 million in 2013 to 55.4 million in 2022.
Engineers developed Chevrolet’s improved start/stop system using knowledge gained from working on GM’s eAssist system. A team of software engineers focused on making the shutdown/start sequence feel seamless to the customer and developed algorithms for “change-of-mind events,” in which the driver begins to stop then suddenly accelerates. They also programmed the system to consider cabin temperature, humidity, battery charge and other factors when deciding to shut off the engine or not.
“Stop/start system customer research indicates they want the engine to start up as quickly and smoothly as possible after a stop,” said Chevrolet Global Vehicle Performance manager, Mark Myers.
The 2.5-liter Impala equipped with standard start/stop technology will return an EPA-estimated fuel economy rating of 22 mpg city and 31 highway, equating to 25 combined mpg. Start/stop technology is not available on models equipped with the 3.6-liter V6 engine option. The 2.5-liter 2015 Impala will go on sale this summer with a starting price of $27,735, excluding tax, title, license and dealer fees.