The 2001 Pontiac Bonneville is available as a 4-door, 5-seat sedan. Starting at $25,220, the 2001 Pontiac Bonneville SE is powered by a 3.8LL , 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 2001PontiacBonnevilleSSEi , priced at $ 32,560 , is powered by a 3.8LL , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 28-mpg on the highway.