2020 Hyundai Sonata will emit less with new valve-duration tech

2020 Hyundai SonataHyundai last week announced that it has developed what it claims is the world’s first mass-production continuously variable valve duration (CVVD) technology. The company asserted the new valve tech, headed into versions of the 2020 Hyundai Sonata, will produce significant improvements in emissions, fuel efficiency, and performance. The...