Chevrolet announced that they’ve made some minor changes to the 2015 Impala sedan, which results in a slight bump in fuel economy as well as some changes to improve the quietness of the car.
For starters–no pun intended–Stop/Start Technology has been made standard on the base 2.5L ECOTEC Impala, allowing for a five percent increase on both the city and highway ratings, or the equivalent to one mile per gallon on both. Stop/Start is not available for Impalas equipped with the 3.6L V6. The final tallies for the 2.5L powered Impala though are 22 mpg city and 31 mpg highway with a combined rating of 25 mpg.
Additionally, other revisions were made to reduce the noise and vibration of the power and drivetrain.
The 2015 Chevrolet Impala will begin hitting showrooms later this summer with prices starting at $27,735 for the 2.5L base model. The LT V6 starter model retails for $30,960.
Check out the full details after the jump.
Chevrolet Makes Stop/Start Standard in 2015 Impala
Technology improves city fuel economy by 5 percent
DETROIT – Stop/start technology will be standard on the 2015 Impala base 2.5-liter ECOTEC® engine, an addition that improves the vehicle’s city fuel economy by nearly 5 percent, or one mile per gallon.
The Impala comes standard with a four-cylinder engine, which currently accounts for more than 30 percent of Impala retail sales. It offers customers higher mpg city ratings and a more affordable entry price into the segment than six-cylinder competitors.
Stop/start shuts down the engine in certain driving conditions to reduce fuel consumption. The technology is becoming more prevalent worldwide. A recent report from Navigant Research predicted worldwide sales of vehicles with stop/start technology will grow from 8.8 million in 2013 to 55.4 million in 2022.
The 2.5L Impala with stop/start yields an EPA-estimated fuel economy of 22 mpg city, 31 for the highway and 25 combined. The Impala with the 3.6L V-6 engine will not include stop/start technology.
The Impala becomes the second vehicle in Chevrolet’s U.S. lineup to feature stop/start technology, following the segment-first standard inclusion in the 2014 Malibu introduced late last year. The technology helps improve the Malibu’s city fuel economy by 14 percent.
Chevrolet engineers developed the stop/start in the Impala from extensive experience with GM’s eAssist system and the accompanying algorithms that allow engines to engage and disengage subtly.
“Stop/start system customer research indicates they want the engine to start up as quickly and smoothly as possible after a stop,” said Mark Meyers, Chevrolet Global Vehicle Performance manager.
During the development of this technology, a team of software engineers was created. The Center for Excellence focuses on advancing stop/start technology and making its operation seamless to the customer.
A big challenge for the team was overcoming “change-of-mind events,” instances in which the driver begins to stop, but then quickly accelerates. The algorithms adapt the system so the starter can fire even if the engine did not fully shut off.
The smart software also prevents the system from engaging if the car does not reach 6 mph since its last start, a welcome feature in stop-and-go-driving conditions. The system also considers cabin temperature, humidity, battery charge and other factors when deciding if the engine should come to a stop.
Hardware revisions also have been made. The noise and vibration team worked closely with drivetrain engineers to revise motor mounts to provide the greatest isolation possible from the cabin. Additionally, the team included a larger heavy-duty starter motor to assist with the additional ignition cycles.
The 2015 Impala goes on sale this summer with a suggested starting price of $27,735 for the 4-cylinder LS model, and $30,960 for the 6-cylinder LT model. These include an $825 destination charge, but exclude tax, title, license and dealer fees.
For the 2015 model year, the Impala will be available with two powertrains, a standard 2.5L engine with stop/start, and a premium 3.6L six-cylinder engine.
Founded in 1911 in Detroit, Chevrolet is now one of the world’s largest car brands, doing business in more than 140 countries and selling more than 4.9 million cars and trucks a year. Chevrolet provides customers with fuel-efficient vehicles that feature spirited performance, expressive design, and high quality. More information on Chevrolet models can be found at www.chevrolet.com.
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