SAN FRANCISCO (MarketWatch) -- November crude dropped 93 cents to close at $57.59 a barrel Wednesday, marking the contract's weakest closing level since June 2005 as traders eyed the latest news from key oil producers and awaited Thursday's data on U.S. petroleum supplies. November unleaded gasoline fell 1.65 cents to close at $1.4503 a gallon and November heating oil closed at $1.672 a gallon, down 0.89 cent. November natural gas fell 31.6 cents, or 4.9%, to end at $6.15 per million British thermal units