In 2006, The United States used more oil than the next 20 countries combined. By 2010, that had changed, and the statement would have been: The United States used more oil than the next 5 countries combined. That’s not because the United States consumption went down, but everyone else’s skyrocketed. There is the chart as of 2010:

This might be more useful in graphic format, so here it is:

Source of date: The World Factbook – CIA