Input (grade 4): According to official reports, the ship was carrying 53.1 million U.S. gallons (about 200 million litres) of oil, of which 10.8 million U.S.gallons were spilled into the Prince William Sound.
Output (grade 3): 10.8 million U.S. gallons (9.0 million imp gal/41 million L) were spilled into the Prince William Sound.