There's an old German proverb that goes something like this: "And Alexander wept, for there were no more niches left to conquer." The 2016 BMW 6 Series Gran Coupe represents the source of the great general's pain, as its insertion into the uniquely Teutonic sphere of four-door "coupes" gives BMW traction with yet another sliver of a customer base that, when all are added together, helps keep it near the head of the global luxury pack.
Regardless of your position on BMW's decision to slice the premium market into dozens of ultra-thin wedges, it's hard to deny that the 6 Series Gran Coupe makes an impression. Its long, cylindrical proportions call to mind a stealthy submarine, and indeed its periscope is locked firmly on rivals from Audi and Mercedes-Benz in an effort to snag well-heeled style-conscious buyers. I spent a week behind the wheel of the top-tier 2016 BMW 650i xDrive Gran Coupe to see how well the uniquely-tailored four-door fit into my day-to-day.