美国至6月20日当周API取暖油库存 -71.7万桶，前值47.4万桶。

Group 1 - The core point of the article indicates a significant decrease in U.S. heating oil inventories, with a reduction of 717,000 barrels for the week ending June 20, compared to an increase of 474,000 barrels in the previous period [1] Group 2 - The current inventory level reflects a tightening supply situation in the heating oil market, which may influence pricing dynamics in the near term [1] - The change in inventory levels could signal shifts in demand or supply factors affecting the heating oil sector [1]