Bmw M850I / Review: 2019 BMW M850i xDrive Convertible | CAR : What exactly is a bmw m850i xdrive? . Bmw m850i exterior in barcelona blue and sunset orange. The 2019 bmw m850i xdrive coupe is priced at $111,900 plus $995 destination and handling. The bmw m850i xdrive fully unleashes the race car genes of the bmw 8 series coupé. But drive it with the roof down regularly, which hurts aerodynamics, and while using lots of the horsepower. The m850i is rated for 17 miles per gallon city and 26 mpg highway, which really isn't a bad number for the car's size and power. Bmw m850i exterior in barcelona blue and sunset orange. The m850i is rated for 17 miles per gallon city and 26 mpg highway, which really isn't a bad number for the car's size and power. The bmw e31 is the first generation of the bmw 8 series. It was the most expensive bmw model of that time. It is a grand tourer built by bmw from 1990 to 1999 powered by either a v8 or v12 engine.