These advantages include a two - percent improvement in performance (via increased volumetric efficiency), two - percent improvement in fuel economy (via reduced pumping losses) and a 30 percent reduction in hydrocarbon emissions. (thekoreancarblog.com)
The engine includes a variable induction control system to improve volumetric efficiency at low and middle speed ranges, while an efficient belt layout reduces maintenance requirements and aids fuel efficiency. (infinitiusa.com)
Variable Induction Systems to Improve Volumetric Efficiency at Low and / or Medium Engine Speeds (toyota-global.com)