Hedge funds reduced bullish bets on gasoline by the most since June as stockpiles surged to an 11-month high before a cold blast that probably will curb demand in the U.S. Midwest and Northeast.

Money managers cut net-long positions, or wagers on rising prices by 22 percent in the week ended Jan. 14 to the lowest level since Nov. 19, U.S. Commodity Futures Trading Commission data show. Short positions more than doubled.