1 of 20 Josh Miller/CNET
Infiniti restyled its M sedan for the 2011 model year, and added a much bigger engine choice. Although the interior is much improved, the size of the M56X keeps it from truly competing with flagship sedans from luxury competitors.
2 of 20 Josh Miller/CNET
Infiniti established its design language earlier this decade, using raised fender lines embracing the hood's graceful curve. Rear styling on the M56X also creates a unique look with more curving architecture.
3 of 20 Josh Miller/CNET
Although you can still get the M with a 3.5-liter V-6 engine, the new top engine is this 5.6-liter V-8. It makes 420 horsepower and 417 pound-feet of torque, giving the M56X substantial acceleration.
4 of 20 Josh Miller/CNET
Although the front seats are quite comfortable, the rear area is just a little cramped, which keeps the M56X from competing with cars like the Mercedes-Benz S-class and Lexus LS.
5 of 20 Josh Miller/CNET
The X in the name means this car comes with all-wheel-drive. The suspension is not adjustable, but maintains a sporty firmness.
6 of 20 Josh Miller/CNET
Trunk space is not excessive, as the rear of the car is a little short.
7 of 20 Josh Miller/CNET
Infiniti did an excellent job improving the interior, using fine materials and a beautiful silver flecked gloss on the wood trim.
8 of 20 Josh Miller/CNET
The seven-speed-automatic transmission is the only gearbox choice. It lacks paddle shifters to give the car a sport character.
9 of 20 Josh Miller/CNET
This dial changes the power train response, and the Eco mode additionally actually creates resistance on the gas pedal to discourage fast acceleration.
10 of 20 Josh Miller/CNET
Along with its many driver aid features, the M56X has blind spot detection.
11 of 20 Josh Miller/CNET
Infiniti refined its cabin tech controller, making it more befitting a luxury car.
12 of 20 Wayne Cunningham/CNET
The navigation system maps show some 3D buildings.
13 of 20 Josh Miller/CNET
Traffic data is used to dynamically reroute around problems.
14 of 20 Josh Miller/CNET
The M56X shows extensive weather information in its navigation system, including this countrywide map.
15 of 20 Josh Miller/CNET
Zagat ratings for restaurants are a helpful navigation feature, but the interface is poorly arranged.
16 of 20 Josh Miller/CNET
With iPod integration the M56X even shows album art.
17 of 20 Josh Miller/CNET
These shoulder speakers complement the other 12 speakers in the audio system, for a total of 16.
18 of 20 Josh Miller/CNET
The Bluetooth phone system includes dial by name voice command.
19 of 20 Josh Miller/CNET
With multiple numbers for an address contact, the car asks which one you want to dial.
20 of 20 Josh Miller/CNET
The M56X's rear view camera shows overlays for distance and trajectory, particularly useful for parallel parking.