Since the middle 80's, a comparative labelling program for energy consumption of domestic appliances has been implemented in Brazil, which is now extended to vehicles. This program is coordinated and ruled by INMETRO - Brazilian Government Institute for Metrology, Standardization and Industrial Quality, with the participation of other Brazilian Government Programs for energy and fuels conservation, the automotive industry and PETROBRAS - the Brazilian Petroleum Company. Since 2005, a vehicle task-force group has been working on the vehicle test and classification protocols, where specific requirements were included to consider a variety of fuels, including flex fuel vehicles, in a single comparison basis, since most new cars are flex fuel in Brazil. For this purpose, the fuel consumption is measured according to a Brazilian Standard based on the US-FTP-75 and highway test procedures, converted to energy basis, in MJ/km, and the final number is ranked within each vehicle category. This Program was simulated in more than one hundred vehicles in 2008 and has started in 2009 in a voluntary basis. Once inscribed in the Program, the voluntary manufacturer must submit at least 50% of vehicle models to be tested, approved, classified and labelled before commercialization. For market surveillance and control, a sample of the production models is selected every year to be retested by INMETRO's accredited laboratories network. The classification is divided into 5 levels, A to E, based on the median value which defines the central range.