Crude oil prices dropped overnight, but returned to $92 per barrel by Thursday morning. On the New York Mercantile Exchange, West Texas Intermediate crude for November delivery added $1.05 to $92.30 per barrel. Natural gas prices gained 3.6 cents to $3.511 per million British thermal units. Home heating oil added 2.99 cents to $3.243 per gallon. Reformulated blendstock gasoline dropped 2.34 cents to $2.9359 per gallon. At the pump, the average price for a gallon of regular unleaded gasoline was $3.813 per gallon, unchanged from Wednesday, AAA reported.