Sorry for the late publishing but FRED did not update the graphs until today. The rise was 100% due to California. Average prices by region follow after the "Read More".
The graph represents the weighted average of gasoline based on sampling of approximately 900 retail outlets, 8:00AM Monday. The price represents self-service unless only full-service is available and includes all taxes. See (http://www.eia.doe.gov/oil_gas/petroleum/data_publications/wrgp/mogas_home_page.html) for further definitions. All Formulations includes both conventional gasoline and reformulated gasoline.