Roy Bouharb fills up a customer's tank at the Watergate Exxon on Virginia Avenue NW in Washington, DC May 26, 2004. This station's cheapest gas is 6 cents costlier than its competitor across the street; customers cite service and convenience as their reason for spending more.  ( Maya Alleruzzo / The Washington Times )

Photo by: MAYA ALLERUZZO

Roy Bouharb fills up a customer's tank at the Watergate Exxon on Virginia Avenue NW in Washington, DC May 26, 2004. This station's cheapest gas is 6 cents costlier than its competitor across the street; customers cite service and convenience as their reason for spending more. ( Maya Alleruzzo / The Washington Times )