The Sienna’s one of the best-selling minivans in America, and for good reason. It’s spacious, safe, posts good fuel economy figures. Minivans are all about space and functionality. At more than 200 inches long, and more than 78 inches wide, the Sienna’s a big van. There’s space everywhere, even in the third row. The front seats get a regal seating position, and even in the second row, a basic bench is comfortable, with expansive head and leg room–and it slides on an elongated track so that either second- or third-row leg room can be expanded.