Two Sedans with more similarities, such as the body structure, market segment, ground shadow size, height, and maximum occupancy, than differences, like the starting price, horsepower, and fuel economy. First of all, the 2016 Audi A8 is priced $18,400 lower compared to the base MSRP of the 2016 Maserati Quattroporte. And finally, a bigger engine usually means less mpg. But the 2016 A8 has a more powerful engine and it gets 1 more mpg than the 2016 Quattroporte. Among similarities are the body structure, market segment, ground shadow size, height, and maximum occupancy.