Motor1.com generally doesn’t do instrumented performance testing on new vehicles, but Car and Driver has done just that for decades. Last year BMW pulled the covers from its mildly updated 5 Series, including the snazzy M550i xDrive packing a 523-horsepower (390-kilowatt) twin-turbocharged V8 under the hood. BMW says it reaches 60 mph in a scant 3.6 seconds, but the C&D team found otherwise. Eventually, so did BMW. More on that in a bit.
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