Two Coupes with more similarities, such as the body structure, market segment, ground shadow size, height, and maximum occupancy, than differences, like the starting price, fuel economy, and horsepower. First of all, there is a notable difference in the starting price of the 2016 BMW 6 Series Coupe, which is $55,525 less than the base MSRP of the 2016 Maserati GranTurismo. And finally, the 2016 GranTurismo has bigger and thirstier engine; the 2016 6 Series Coupe gets 5.5 more mpg. Among similarities are the body structure, market segment, ground shadow size, height, and maximum occupancy.