A meeting of OPEC and its allies ended without any decision to further increase oil output despite U.S. President Donald Trump's call for lower prices.

GasBuddy.com's Dan McTeague says the extended cold weather has led an an increase at the pumps.

Oil prices slipped Monday, pressured by doubts that large oil producers will reduce production as promised and on expectations that U.S. production would increase again this year.

Oil prices jumped more than $1 a barrel on Thursday on news that key OPEC members were cutting production as promised and on forecasts of strong demand growth in China.

Oil prices rose on Thursday after Saudi Arabia started talks with customers about a reduction in crude sales to support a plan by OPEC to lower global supply.

Oil prices hit 18-month highs on Tuesday buoyed by hopes that a deal between OPEC and other big oil exporters to cut production will drain a global supply glut.

Oil rose to an 18-month high Monday after OPEC and some of its rivals reached their first deal since 2001 to jointly reduce output to try to tackle global oversupply and boost prices.

OPEC and non-OPEC producers on Saturday reached their first deal since 2001 to curtail oil output jointly and ease a global glut.

OPEC's oil output set another record high in November ahead of a deal to cut production.

Saudi Energy Minister Khalid al-Falih said he was optimistic OPEC would formalize a preliminary oil output deal reached in Algeria in September.