The 2001 Buick Century is available as a 4-door, 5-seat sedan. Starting at $20,020, the 2001 Buick Century Custom is powered by a 3.1L, 6-cylinder engine mated to an automatic transmission that returns an EPA estimated 20-mpg in the city and 29-mpg on the highway. The top of the line 2001 Buick Century Limited, priced at $22,991, is powered by a 3.1L, 6-cylinder engine mated to an automatic transmission that returns an EPA estimated 20-mpg in the city and 29-mpg on the highway.