The 2015 Chevrolet Impala offers a range of powerful, fuel-efficient engines, making it our pick in this important category. The base engine is a 2.5-liter four-cylinder, rated for 195 horsepower and 187 pound-feet of torque. It comes with a stop-start system that turns the engine off when the Impala is stopped in traffic, reducing fuel usage. It achieves 22 city/31 highway mpg. Impala LT and LTZ shoppers can choose the available 3.6-liter V6 engine. It produces 305 horses and 264 pound-feet of torque, maximizing highway acceleration and on-road traction. Finally, a bi-fuel Impala model comes with a modified version of the 3.6-liter V6 that holds up to 7.8 gallons of compressed natural gas (CNG) in a trunk-mounted tank. A full tank of CNG is good for about 150 miles of city driving. When the CNG runs out, the engine automatically switches to regular fuel. Running on CNG, the modified engine delivers 230 horses and 218 pound-feet of torque.

The Toyota Camry’s base engine is a 2.5-liter four-cylinder that makes 178 horses and 170 pound-feet of torque. On the road, it achieves 25/35 mpg. Camry SXE and XLE drivers can choose the available 3.5-liter V6 engine for an output of 268 horses and 248 pound-feet of torque.

Inside, the Chevy Impala delivers impressive passenger space. The generous wheelbase creates serious room in both the front and rear seats, giving families the comfort and support they need for long commutes and road trips. Depending on trim model, shoppers can choose from a variety of upholstery options, including leather and a cloth-suede combination. The trunk delivers ample space, with 18.8 cubic feet for items like weekend bags and family-friendly grocery hauls. The standard 60/40-split-folding rear seats increase cargo space as needed.

The Toyota Camry is a close second in this department. Its cabin is one of the roomiest in the mid-size sedan segment. The trunk delivers 15.4 cubic feet of cargo space.

The 2015 Chevrolet Impala delivers a long list of standard comfort and convenience features. Modern drivers will appreciate the standard 4G LTE Wi-Fi connection, which lets passengers add up to seven devices and browse the Web on the go. It’s easy to stream music from devices via the available Bluetooth audio connection. The optional MyLink technology gives users access to a wide range of infotainment apps via an 8-inch touchscreen. Higher trims offer luxury items like leather upholstery and heated and ventilated front seats.

The Camry comes with a few impressive standard features of its own. Keyless entry saves time in the parking lot. As with the Impala, the Camry’s standard Bluetooth phone connection lets drivers make hands-free calls. The Entune infotainment system delivers apps via a 6.1-inch touchscreen interface.

We like the 2015 Chevrolet Impala’s impressive crash test scores and high-tech safety equipment. The Insurance Institute for Highway Safety gave the Impala its top score of “Good.” In government crash tests, the Impala earned four out of five stars for overall protection. It comes standard with OnStar telematics, which helps drivers solve problems with features like an emergency assistance button and automatic crash notification.

Like the Impala, the Camry comes standard with items designed to maximize on-road control, including antilock disc brakes and traction and stability control. The Camry also gets a standard rearview camera, making backing up a snap. Both models offer high-tech options designed to maximize driver vigilance, including blind-spot warning and rear cross-traffic alert systems.