Oil prices slipped on Thursday after a surprise increase in US gasoline inventories, with investors awaiting the OPEC+ meeting this weekend. Brent crude futures fell by 0.2% to $72.69 per barrel, while US West Texas Intermediate crude futures also dropped 0.2% to $68.58 a barrel. US gasoline stocks rose by 3.3 million barrels, countering expectations for a small draw in fuel stocks. OPEC+ is expected to discuss a further delay to a planned oil output hike that was due to start in January.