Moving a Nation to Care Home | Blogs | Unenergy's blog 400 million gallons = 40 Exxon Valdez May 18, 2010 - 23:12  |  Unenergy Exxon Valdez spilled an estimated minimum 10.8 million US gallons (40.9 million litres, or 250,000 barrels) of crude oil. Why BP Won't Measure the Oil Spill Independent