Here are the comparisons of the Exxon Valdez tanker spill vs. the Deepwater Horizon well blowout…………..If the 25,000 barrel-a-day estimate is accurate (it may turn out to be conservative) and the leak lasts for 90 days, that would total 2.25 million barrels, or 94.5 million gallons vs. 11 million gallons for the Exxon Valdez tanker disaster.  The BP PLC oil spill in the U.S. Gulf of Mexico is potentially “catastrophic” and could turn out to be worse than the Exxon Mobil Corp. Valdez spill in Alaska, Interior Secretary Ken Salazar said Sunday. “The worst-case scenario is we could have 100,000 barrels [a day] or more of oil flowing out,” Mr. Salazar said on CNN’s “State of the Union.”  The spill occurred after the Deepwater Horizon drilling rig blew out on April 22, killing 11 people and leaking crude oil into the Gulf of Mexico. The slick is threatening the coastal region’s fishing, tourism and shipping industries.   BP and the U.S. government have over the past week stuck to their raised estimate of 5,000 barrels a day spilling out of the deepwater well. But Homeland Security chief Janet Napolitano on Sunday told ABC News’s “This Week” that the current spill rate could currently be much higher.  “Right now that could be in the tens of thousands of gallons per day, of barrels per day,” she said, without elaborating which figure was more accurate. One barrel of oil is 42 gallons.  The Valdez spill, caused by a wrecked tanker heading for Long Beach,California, spilled 11 million gallons of crude over three months in 1989, devastating part of Alaska economically and environmentally. If the 25,000 barrel-a-day estimate is accurate and the leak lasts for 90 days, that would total 2.25 million barrels, or 94.5 million gallons. The Exxon Valdez spill, caused by a wrecked tanker, spilled 11 million gallons of crude over three months in 1989, devastating part of Alaska economically and environmentally.