Gasoline prices are displayed on a sign at a filling station in Oakland, Calif. Gas prices have been on a roller-coaster ride over the past decade, dropping to near $1 after President George W. Bush's first year in office, crossing the $2 mark in 2005 and reaching $4 in June 2008 before Congress and Mr. Bush took action, lifting presidential and congressionally imposed moratoriums on expanding offshore drilling on the Outer Continental Shelf. (Associated Press)

Gasoline prices are displayed on a sign at a filling station in Oakland, Calif. Gas prices have been on a roller-coaster ride over the past decade, dropping to near $1 after President George W. Bush's first year in office, crossing the $2 mark in 2005 and reaching $4 in June 2008 before Congress and Mr. Bush took action, lifting presidential and congressionally imposed moratoriums on expanding offshore drilling on the Outer Continental Shelf. (Associated Press)