Where are you getting your numbers that we use 20mbpd? As I understand it, that's not the case.
The world uses 84mbpd.  We use 25% of that.  I am not on my normal machine, so I don't have my resources handy, someone throw up one of the references to that please?
The CNN graphic is the quickest reference I have handy.  It is now below the fold of the post.
The U.S. Energy Information Agency has a table in pdf format that lists U.S. oil consumption. 2002 average consumption: 19.7 mbpd; 2003: 20.0 mbpd; 2004: 20.7 mbpd; 2005 (first three months only): 20.6 mbpd.
thanks IL.