The 2000 Buick LeSabre is available as a 4-door, 5-seat sedan. Starting at $23,400, the 2000 Buick LeSabre Custom 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 30-mpg on the highway. The top of the line 2000BuickLeSabreLimited , priced at $ 27,885 , 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 30-mpg on the highway.