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 3.8L, 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 2001 Pontiac Bonneville SSEi, priced at $32,560, 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 28-mpg on the highway.