.Power, Plus Efficiency A choice of two responsive DOHC engines will be available: a 3.5-liter V6 or 2.7-liter four-cylinder engine. Both engines offer the latest in efficient, lightweight technology, including Dual Variable Valve Timing with intelligence (VVT-i), roller rocker arms and an Acoustically Controlled Induction System (ACIS) that changes the length of the air-intake pipe to supply more torque on demand.
The 3.5-liter V6 makes 266 horsepower at 6,200 rpm, with expected EPA-estimated
mileage ratings of 18 mpg city/24 mpg highway (16 mpg city/22 mpg highway on AWD models). It also has a 3,500-pound tow capacity. With 187 horsepower at 5,800 rpm, the 2.7-liter four-cylinder engine produces responsive power that exceeds some competitors V6 performance, while delivering expected EPA-estimated fuel efficiency ratings of 19 mpg city and 26 mpg on the highway.
Both engines are matched with state-of-the-art, electronically controlled six-speed
transmissions with sequential shift that provide smooth gear-shift feeling, quiet performance and a lightweight, compact size.
The suspension uses front MacPherson struts, combined with rack-and pinion steering
for smooth, linear steering feel. Electronic Power Steering (EPS) delivers a more solid direct on-road feel. With a wider stance, the new Sienna has a more direct steering feel. Under-body aero parts also contribute to dynamic performance.