The 2005 Buick Rainier is available as a 4-door, 5-seat sport utility. Starting at $33,785, the 2005 Buick Rainier 4x2 is powered by a 4.2L, 6-cylinder engine mated to an automatic transmission that returns an EPA estimated 16-mpg in the city and 21-mpg on the highway. The top of the line 2005 Buick Rainier AWD, priced at $35,610, is powered by a 4.2L, 6-cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 20-mpg on the highway.