The 2000 Pontiac Grand Prix is available as a 4-door, 5-seat sedan. Starting at $21,665, the 2000 Pontiac Grand Prix GT Coupe is powered by a 3.8L , 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 2000PontiacGrand PrixSE Sedan , priced at $ 19,935 , 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 30-mpg on the highway.