Crude oil prices, poised for a fifth week of losses in the past six weeks, slipped under $102 per barrel Friday. West Texas intermediate crude, which had begun the week close to $104 per barrel, was down to $101.74. Reformulated blendstock gasoline prices added 6.44 cents to $2.6874 per gallon. Home heating oil lost 3.11 cents to $3.0389 per gallon. Natural gas added 4 cents to reach $3.77 per million British thermal units. At the pump, the national average price of unleaded gasoline dropped to $3.345 per gallon from Thursday\'s $3.351, AAA\'s Daily Fuel Gauge Report said.