The IEA, in partnership with the GFEI, and with a grant from the FIA Foundation (a GFEI partner), has undertaken a research program on fuel economy of light-duty vehicles (LDVs) around the world. This brief is a product of that effort, and reports on IEA's analysis of vehicle characteristics, including fuel economy, in 21 countries around the world and the EU. In particular, it reports what may be the first ever global average estimate for LDV fuel economy world-wide.