Average retail price of U.S. gasoline black and price predicted on the basis of price of Brent crude oil blue.  Black average U.S. price of retail gasoline, all formulations, in dollars per gallon, weekly Jan 10, 2000 to June 16, 2014 data source EIA.  Blue 0.84 plus 0.025 times price of Brent, in dollars per barrel, weekly Jan 7, 2000 to Jun 13, 2014 data source EIA.