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2015 model shown 15/23 mpg 4.5 sec 400 hp 154 mph Overview: The 6-series is BMW’s most exclusive offering, embodying the spirit of elegant grand touring in a most modern fashion. As a coupe or convertible, the 6-series is available with either a 315-hp 3.0-liter inline-six (640i) or 445-hp 4.4-liter V-8 (650i); both engines mate to an eight-speed automatic. Rear-wheel drive is standard, while all-wheel drive is available for all-weather ability. There is also an M Sport package with even more upscale interior and exterior accents for extra bling