The 2002 Buick Regal is available as a 4-door, 5-seat sedan. Starting at $23,485, the 2002 Buick Regal LS is powered by a 3.8L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 19-mpg in the city and 29-mpg on the highway. The top of the line 2002BuickRegalGS , priced at $ 27,485 , is powered by a 3.8L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 27-mpg on the highway.