Crude oil prices top $81

April delivery light, sweet crude shed 37 cents from an intraday high to settle at $81.50 per barrel. Heating oil prices lost 0.007 cents to $2.0985 per gallon. Reformulated gasoline blendstock fell 0.0192 cents to $2.27 per gallon. Henry Hub natural gas prices shed 0.007 cents to $4.52 per million British thermal units.

At the pump, the national average price of unleaded gasoline was $2.759 per gallon Tuesday, up from Monday's $2.753, AAA said.

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