The 2005 Audi A8 is available as a 4-door, 5-seat sedan. Starting at $69,900, the 2005 Audi A8 L 4.2 Quattro Long Wheelbase Sedan is powered by a 4.2L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 24-mpg on the highway. The top of the line 2005AudiA8W12 Quattro Long Wheelbase Sedan , priced at $ 117,400 , is powered by a 6.0L , 0 - cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 21-mpg on the highway.