U.S. oil supplies climbed to the highest level in more than 21 years as production increased and refineries prepared to bolster fuel output to meet summer demand, a Bloomberg survey showed.
Stockpiles advanced 2.5 million barrels, or 0.7 percent, to 375.5 million in the seven days ended Friday, according to the median of 10 analyst estimates before an Energy Department report today. That would bring supplies to the highest level since September 1990.
