The 2012 Subaru Impreza, which will arrive in Subaru dealerships thi fall, offer a 30-percent improvement in fuel economy over the outgoing versions, along with increased room, greater agility and a higher level of refinement. Powered by an all-new 148-hp 2.0-liter Boxer engine, the 2012 Subaru Impreza comes with a choice of a five-speed manual