Original: 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 .
Simplified: 10.8 million U.S. gallons ( 9.0 million imp gal/41 million L ) were spilled into the Prince William Sound .