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GREEN | 6 out of 10
2014 Chevrolet Impala: 21 mpg combined (18 mpg city, 28 mpg highway) for the V-6 model; 25 mpg combined (22 mpg city, 31 mpg highway) for base 2.5-liter four
The 2015 Chevy Impala is losing its top mileage-getter for the new model year, while it's also adding stop/start to the base four-cylinder. In the end, the mileage weighting of the lineup goes down a little bit.
The former Impala Eco was fitted with GM's mild-hybrid eAssist system, and wore special aero add-ons--dams, spats, and active grille shutters that smooth the nose for better efficiency--to gain a 29-mpg combined figure.
With it gone, the stop/start four-cylinder is the efficiency leader (the six-cylinder won't be getting the technology).The EPA hasn't published the Impala's final gas-mileage ratings, but Chevy estimates the base vehicle will come in at 25 mpg combined (22 mpg city, 31 mpg highway).
Last year the more powerful V-6 checked in at 21 mpg combined (18 mpg city, 28 mpg highway). The combined rating for the V-6 falls below the Toyota Avalon's 25 mpg, the V-6 Taurus' 23 mpg combined, and the 23-mpg figure posted by the Hyundai Azera and the Dodge Charger with its eight-speed automatic.
In our first-drive test loop set up by Chevy, the V-6 Impala's indicated economy checked in at 20.3 mpg, tallied after lots of canyon runs and a few stretches of 75-mph interstate.
We logged 25.1 mpg--right on the nose--for the base 2.5-liter four-cylinder Impala, albeit over a short 20-minute drive covering about 12 miles.
We'll update this section when EPA data is published.
You can do better than the 2015 Chevy Impala for fuel economy in this class, although engine stop/start could pay off for stoplight commuters.