Unlike previous generations of Toyota’s family van, the Sienna is only available as a hybrid. The powertrain consists of a 2.5-liter four-cylinder gasoline engine and two electric motors that produce 245 horsepower. An all-wheel drive is an option that adds a third electric motor in the back to power the rear wheels.
The EPA estimates that front-wheel drive Siennas will get 36 mpg in the city and 36 mpg on the highway, with all-wheel drive models getting 1 mpg less at 35 mpg. With our all-wheel-drive Platinum test vehicle, we achieved 29 mpg in a mix of city and highway driving.