A continuously variable transmission functions as if it had an infinite number of gear ratios. Its changes from ratio to ratio are step-less, contributing to the powertrain's smooth operation. Among its benefits, a CVT wastes less power in transmitting engine torque to the drive wheels. Its efficiencies result in the excellent fuel economy ratings of the non-turbocharged 2010 Subaru Legacy, Outback and 2012 Impreza models are equipped with CVT.