According to the US Government's Energy Information Administration, the United States consumes about 400 million gallons (1.51 billion litres) of gasoline every day. That figure equates to about 20 million barrels of oil every day.
Additional information:
Top 20 countries: 1224.5 (95%)
Rest of world: 68.1 (5%)
World total: 1,292.6
Source: Oil & Gas Journal, Vol. 103, No. 47 (Dec. 19, 2005). From: U.S. Energy Information Administration. http://www.eia.doe.gov/emeu/international/petroleu.html .