The 2010 Buick Lucerne is available as a 4-door, 5-seat sedan. Starting at $29,230, the 2010 Buick Lucerne CX is powered by a 3.9L, 6-cylinder engine mated to an automatic transmission that returns an EPA estimated 17-mpg in the city and 26-mpg on the highway. The top of the line 2010 Buick Lucerne Base, priced at $35,625, is powered by a 3.9L, 6-cylinder engine mated to an automatic transmission that returns an EPA estimated 17-mpg in the city and 26-mpg on the highway.