The 2000 Audi A8 is available as a 4-door, 5-seat sedan. Starting at $62,000, the 2000 Audi A8 Quattro Sedan is powered by a 4.2L, 8-cylinder engine mated to an automatic transmission that returns an EPA estimated 17-mpg in the city and 24-mpg on the highway. The top of the line 2000 Audi A8 Quattro Long Wheelbase Sedan, priced at $67,900, is powered by a 4.2L, 8-cylinder engine mated to an automatic transmission that returns an EPA estimated 17-mpg in the city and 24-mpg on the highway.