Oil prices slipped closer to the $62 a barrel mark Wednesday reflecting growing concerns over a slower-than-expected recovery in the global economy. Prices were lower for the sixth straight day from a peak of above $73 last week, in tandem with continued weakness in Asian stock markets and a stronger U.S. dollar. In other Nymex trading, gasoline for August delivery fell by more than 2 cents to $1.71 a gallon and heating oil lost close to two pennies to fetch $1.59. Natural gas for August delivery was more 4 cents at $3.39 per 1,000 cubic feet. In London, Brent prices shed 15 cents to $63.08 a barrel on the ICE Futures exchange, according to a report of The Associated Press.