Closing prices for crude oil, gold and other commodities, and foreign exchange levels. : Benchmark U.S. crude oil for September delivery fell 81 cents to $68.28 a barrel Friday. Brent crude oil for October delivery fell 59 cents to $70.62 a barrel. Wholesale gasoline for September delivery fell 3 cents to $2.26 a gallon. September heating oil fell 3 cents to $2.08 a gallon. September natural gas was unchanged at $4.14 per 1,000 cubic feet. Gold for December delivery fell $$45.80 to $1,763.10 an ounce.