Regions · Japan

With what has been historically the most fuel-efficient vehicle fleet in the world, Japan was the first to adopt a fuel economy program for medium and heavy-duty vehicles. Light-duty efficiency standards use the Top Runner program, which pegs fuel efficiency standards to the top-performing vehicle in each class. New heavy-duty vehicles are subject to “Post New Long-Term Emissions Standards” which are similar in stringency to Euro VI. Additionally, fuel standards meet the most stringent requirements for sulfur content and contain substantial penalties for non-compliance.