I love this site for tracking gas prices. The graph tells the whole story.
http://www.eia.doe.gov/oil_gas/petroleum/data_publications/wrgp/mogas_home_page.html
note Jan 2007 was where gas prices took off again, Just about when the new Congress took over.
yeah ???and let's just leave out the prices over $3 in summers of 2005,206,2007....so on.