2011 Infiniti M sedan, which is scheduled to go on sale at Infiniti retailers nationwide in spring 2010, will be available in two model designations – the Infiniti M56 with an all-new 420-horsepower 5.6-liter VVEL Direct Injection Gasoline™ V8 and the Infiniti M37 with a 330-horsepower 3.7-liter VVEL V6. Both engines are designed to offer more power and increased fuel efficiency versus the previous generation M’s V8 and V6 engine offerings....