SAN FRANCISCO, CA - FEBRUARY 25: Gas prices over $4.00 per gallon are displayed in front of a Shell gas station on February 25, 2011 in San Francisco, California. As unrest persists in Libya and ... more 
SAN FRANCISCO, CA - FEBRUARY 25: Gas prices over $4.00 per gallon are displayed in front of a Shell gas station on February 25, 2011 in San Francisco, California. As unrest persists in Libya and other Middle-East countries, gas prices have spiked nearly 12 cents per gallon this week and surged 6 cents overnight. The national average price for one gallon of regular increased Friday to $3.287 (Photo by Justin Sullivan/Getty Images) less 
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Getty Images | Photo By Justin Sullivan / Getty Images
Fri, Feb 25, 2011 5:50 PM EST