Many automakers, including Infiniti, use the added “x” on the name to indicate that the specific model features all-wheel drive.
The G37x sedan has everything the G37 Journey — the higher of two trim levels of the rear-wheel-drive G37 — has, plus all-wheel drive (instead of rear-wheel drive) and a snow mode designed to reduce wheel slip. Base price of the G37x is $36,650, $1,600 more than the G37 Journey. EPA estimates for the G37x are 18/25 mpg city/highway, versus 19/27 mpg for the Journey. Both come with a 3.7-liter V-6 and seven-speed automatic.
The same standard equipment differences apply to the G37 Journey and G37x coupes, though the starting prices are higher, $37,500 for the Journey and $39,150 for the G37x. You can get the full story on the 2011 G37 lineup in the Cars.com Research section. That includes the G37x S, which is a sport-oriented trim level.
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