The XE's 224-hp 3.5-liter V6 and four-speed automatic are good enough for most drivers, in our opinion. The base 3.5-liter V6 is much more powerful than the four-cylinders found in most of the base models of the Aura's competition. It could be a touch smoother and quieter under full-throttle, but the strong acceleration speaks for itself. Even better, the engine quiets back down to near silence as soon as cruising speeds are attained.

The XR's 252-hp 3.6-liter V6 is considerably stronger and more relaxed in character, thanks to a more sophisticated engine design. The six-speed automatic comes with optional Tap-Shift paddle shifters on the steering wheel to make manual shifting possible when the selector is moved from D to M. While the XR's engine and transmission are undeniably more enjoyable than those of the XE, they are not so much better as to warrant buying the XR on that basis alone, which is meant to be a testament to the quality of the base 3.5-liter engine rather than a criticism of the 3.6-liter motor. (The XR's Moroccan Brown leather option comes to mind, for example.)

Fuel efficiency is excellent for both models and compares favorably with other mid-size sedans. The Aura XE is rated 20 mpg in the city and 29 mpg on the highway. Even more remarkable is the Aura XR's nearly identical 20 mpg in the city and 28 on the highway, in spite of its significant additional power. Credit the taller gearing of the six-speed automatic, which allows the engine to spin at a lower rpm at highway speeds.

The fully independent suspension splits the difference between ride quality and handling, both of which are quite good. While handling feels much like that of the Saab 9-3 with which it shares its architecture, the ride quality is more like that of a Toyota Camry, which is known for its smoothness. Furthermore, thanks to the use of sound-deadening materials everywhere from the firewall to the side glass and wheelwells, the interior is near-silent even at speeds over 75 mph.

The Aura's variable-ratio power steering is well weighted at highway speeds, offering plenty of road feel, while with just 2.8 turns, lock-to-lock, it's plenty helpful in low-speed parking lot maneuvers. Offsetting that, however, is a particularly wide 40.4-foot turning circle.

The Aura features four-wheel disc brakes with ABS. They felt good and worked well in normal driving.

Traction control is standard on the Aura XE, while the Aura XR is upgraded to Stabilitrack, GM's excellent electronic stability control system.