There will be a 335xi coupe for MY2008 and there is already a 335xi sedan. Snow tires are a requisite regardless of drivetrain. Buy what you want and then reserve a set of snow tires/rims.

Now, if its deep snow, ground clearance will be the issue. But you already have an X5 for those days.

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2014 Mazda 3 GT: Ø Consumption: (click for details)