
The Sienna is a complete redesign for 2011. Two engines are available for this year: a 187-horse 4-cylinder and last year's 265-horsepower 3.5L V6. Each engine comes linked to a new-for-2011 6-speed automatic transmission. What the 4-cylinder lacks in power, it more than makes up for in fuel economy--it's capable of 19 mpg in the city and 26 mpg on the highway-a class-leading achievement.
The Sienna is the only vehicle in its class to offer optional all-wheel drive. Toyota's system utilizes a center differential to split power 50/50 between the front and rear wheels under normal driving situations, but transfers more to the wheels that have...