SAN FRANCISCO - MAY 31:  A gas customer pumps discounted gas into his car May 31, 2007 in San Francisco, California. Shell gas station owner Bob Oyster dropped his gas prices to below $3.00 per gallon for all grades as he prepares to close his gas station after Shell Corporation attempted to raise his rent to over $13,000 per month. Hundreds of people lined up for the cheap gas, some waiting as long as 40 minutes. Getty Images logo Getty Images 30 months ago

SAN FRANCISCO - MAY 31: A gas customer pumps discounted gas into his car May 31, 2007 in San Francisco, California. Shell gas station owner Bob Oyster dropped his gas prices to below $3.00 per gallon for all grades as he prepares to close his gas station after Shell Corporation attempted to raise his rent to over $13,000 per month. Hundreds of people lined up for the cheap gas, some waiting as long as 40 minutes.