The average gasoline consumption in the US is about 9.27 million barrels per day or 389 million gallons per day.
U.S. Finished Motor Gasoline Product Supplied, Monthly
http://tonto.eia.doe.gov/dnav/pet/hist/mgfupus2m.htm
U.S. Weekly Finished Motor Gasoline Product Supplied, Weekly
http://tonto.eia.doe.gov/dnav/pet/hist/wgfupus2w.htm
Thanks for confirming the approximate number I posted earlier.