in japan the top runner programme sets efficiency standards for cars and trucks according to that achieved by the most efficient vehicle in each category china soon to become the largest car market in the world has been applying stringent fuel economy standards since and a new cartax regime which penalizes large cars since in india the absence of mandatory vehicle fuel efficiency standards suggests that the fuel efficiency of vehicles may lag behind that of other countries iea b the bureau of energy efficiency bee has introduced a voluntary energy labelling scheme as a first step to enforcing mandatory fuel economy standards for cars twowheelers and heavy commercial vehicles