Toyota has sold more than 2.2 million Sienna models since its debut in 1997. The fourth-generation Sienna debuted for the 2021 model year, offering hybrid power exclusively and giving customers the benefit of Toyota’s 20+ years of global hybrid leadership and well documented quality, durability and reliability. The 2023 Sienna lays down impressive numbers. Its Toyota Hybrid System II delivers 245 total system horsepower and earns the vehicle a manufacturer-estimated 36 combined MPG fuel economy (front-wheel drive).