Infiniti has been working on an updated version of their M model for 2011. They originally planned to have it for 2010 but needed to go back to the design phase to rethink aspects of design and performance.
Now, after missing the 2010 model year, Infiniti is back with a third-generation M sedan with improved power and features, and again offered with either V-6 or V-8 engines.
Exterior styling follows the trend toward more aggressive overall proportions" put forth by the auto maker. In the rear-drive M37 and all-wheel-drive M37x, the new 3.7-liter V-6 engine develops more power than the 3.5-liter V-6 that it replaces, while yielding improved fuel economy.
Relying upon VVEL (Variable Valve Event and Lift) technology, the V-6 generates 330 horsepower and 270 pound-feet of torque.
The M56's new 5.6-liter V-8 engine offers 30-percent more power than its predecessor of the same size. Specifically, the V-8 generates 420 horsepower and 417 pound-feet of torque, driving a seven-speed automatic transmission.
Infiniti states that in a rear-drive M56 model V-8 earns a highway fuel-economy rating of 25 mpg. The city-driving figure is around 16 mpg. With all-wheel drive, the M56x dips to 16-mpg city/23-mpg highway. Infiniti's V-6 engine also shows improved gas mileage, now rated at 18-mpg city/26-mpg highway with rear-wheel drive, and 17/24 mpg with all-wheel drive.