The 2015 Audi A8 is available as a 4-door, 5-seat sedan. Starting at $81,400, the 2015 Audi A8 3.0T quattro Long Wheelbase Sedan is powered by a 3.0L, 6-cylinder engine mated to an automatic transmission that returns an EPA estimated 19-mpg in the city and 29-mpg on the highway. The top of the line 2015 Audi A8 4.0T quattro Sedan, priced at $86,400, is powered by a 4.0L, 8-cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 30-mpg on the highway.