The 2017 Toyota Sienna is available as a 4-door, 7-seat passenger van. Starting at $29,750, the 2017 Toyota Sienna L 7 FWD is powered by a 3.5L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 19-mpg in the city and 27-mpg on the highway. The top of the line 2017ToyotaSiennaLimited Premium AWD , priced at $ 47,310 , is powered by a 3.5L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 24-mpg on the highway.