Chevy hopes new Impala will revive big-car sales

    By TOM KRISHER, AP Auto Writer Motors Co.’s Chevrolet brand is trying to resuscitate sales of big sedans with a sleek, new version of the Impala.   The family hauler, which mostly sells to rental car companies, is the last model in Chevy’s lineup to be revamped. When it hits showrooms early next year, it will replace an Impala that was last updated in 2005.   The 10th generation Impala gets much of its design from other Chevrolets. Its body slopes from back to front. It has high doors, low-profile side windows and large wheels. The company says the car is quiet. It has sound-deadening insulation and laminated glass in the windshield and windows. The roomy interior has upgraded materials.   Chevrolet thought about changing the Impala’s name, but decided it had significant recognition after 50 years on the market and more than 16 million in sales.   Here are more details about the new car, to be introduced at the New York International Auto Show:   UNDER THE HOOD: Buyers can choose from three engines, all mated to a six-speed automatic transmission. A 2.5-liter four-cylinder will produce 195 horsepower, while a 3.6-liter V-6 will have 303 horses. There’s also a 2.4-liter four with GM’s eAssist system that halts the engine anytime the car stops and uses a small electric motor to help the gas engine get better mileage. All three have direct fuel injection in which the air and fuel are mixed in the cylinder surrounding the piston. That’s more efficient than older engines that mix outside the cylinder.   OUTSIDE: GM says it has strengthened...