Two Sedans with more similarities, such as the body structure, market segment, starting price, ground shadow size, height, and maximum occupancy, than differences, like the powertrain, horsepower, market segment, and fuel economy. First of all, the 2015 BMW ActiveHybrid 5 has bigger and thirstier engine; the 2016 Audi A6 Diesel gets 4 more mpg. Among similarities are the body structure, market segment, starting price, ground shadow size, height, and maximum occupancy.