Two Sedans with some similarities, but otherwise different in most aspects such as the powertrain, horsepower, fuel economy, starting price, and ground shadow size. First of all, the 2016 Maserati Ghibli has bigger and thirstier engine; the 2015 Audi A8 Diesel gets 9 more mpg. Also, there is a notable difference in the starting price of the 2016 Ghibli, which is $14,500 less than the base MSRP of the 2015 A8 Diesel. In addition, the A8 Diesel is slightly larger than the Ghibli. Among similarities are the body structure, market segment, and height.