The 2013 Audi A8 is available as a 4-door, 5-seat sedan. Starting at $78,500, the 2013 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 18-mpg in the city and 28-mpg on the highway. The top of the line 2013AudiA84.0T quattro Sedan , priced at $ 80,900 , is powered by a 4.0L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 17-mpg in the city and 28-mpg on the highway.