The 1999 Toyota Sienna is available as a 3-door, 7-seat passenger van. Starting at $21,508, the 1999 Toyota Sienna CE is powered by a 3.0L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 24-mpg on the highway. The top of the line 1999ToyotaSiennaXLE , priced at $ 26,574 , is powered by a 3.0L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 24-mpg on the highway.