Oil prices finish week off NEW YORK, May 11 (UPI) -- Crude oil prices closed down Friday, dropping 95 cents to settle at $96.13 a barrel on the New York Mercantile Exchange. Natural gas added 2 cents to end the session at $2.51 per million British thermal units. Home heating oil dipped 2 cents to $2.96 per gallon. Gasoline lost a penny to close at $3 a gallon.