The projected change in the average fuel efficiency of light-duty vehicles from model year 1990 to model year 2010 is shown here for the populated areas. The projection was based on the business-as-usual case, which assumes that there are no major policy changes in the 1990 to 2010 period, which would affect new light-duty vehicle preferences. Light-duty vehicles include all cars and light trucks. Vehicles consume a substantial part of energy, and average vehicle fuel efficiency is an important indicator for greenhouse gas emission and climate change policy making. The lower the fuel efficiency, the higher the emission per vehicle, and, consequently, the greater the contribution to greenhouse gases. The greatest projected improvement would be in Saskatchewan.