I can't speak to Deepwater Horizon's 100,000 gallon estimate, but you didn't read the linked article to the Ixtoc spill very carefully. The 70,000 estimate was for the oil that actually made it onto the beaches and it was measured in barrels not gallons. So that alone adds up to 2,940,000 gallons. The overall volume of the spill was esitmated at 3,000,000 barrels so that would be 126,000,000 gallons at 42 gallons per barrel.
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I can't speak to Deepwater Horizon's 100,000 gallon estimate, but you didn't read the linked article to the Ixtoc spill very carefully. The 70,000 estimate was for the oil that actually made it onto the beaches and it was measured in barrels not gallons. So that alone adds up to 2,940,000 gallons. The overall volume of the spill was esitmated at 3,000,000 barrels so that would be 126,000,000 gallons at 42 gallons per barrel.