In 2010, the Infiniti G sedan line expanded with the addition of the 2.5-liter, V6-equipped G25 sedan. This year, Infiniti will develop the line further by concentrating on redesigning the Limited Edition and Sport Appearance Edition models. Let's start by taking a look at the refined Infiniti G37 Limited Edition.

The 2012 Infiniti G37 Limited Edition is a little more traditional, exchanging last year's Monaco Red interior for a sleek...

There are hybrids, and then there are high-performance hybrids. The Infiniti M35h is a high-performance hybrid. Where 350 horsepower and 32 mpg meet, it claimed a spot in the Guinness World Records this August, as the fastest accelerating hybrid available. But, that's old news, now. More recently, the Infiniti M35h carved out a prestigious fuel-economy class, all its own.

How did the high-performance hybrid manage such a feat? In a UK-based competition focused on…