Oil gained for a second day after climbing the most in more than three weeks as U.S. output fell and stockpile growth slowed. Futures advanced as much as 2.4 percent in New York after rising 5.8 percent Wednesday, the most since Feb. 22. Production slid to the lowest level since November 2014 and crude inventories expanded by 1.3 million barrels, the smallest reported gain in five weeks, according to government data. Producers from OPEC and outside the group are finalizing a plan to discuss freezing output at a meeting in Doha on April 17, according to Qatar’s Energy Minister. “U.S. output is inching in the right direction,” Ric Spooner, a chief analyst at CMC Markets in Sydney, said by phone. “Oil has climbed from its lows, but we are starting to get into territory where the price is going to need fundamentals to catch up to push it further. […]