World oil prices fell Tuesday from all-time highs of near 140 dollars amid uncertainty over Saudi Arabia's pledge to increase production output, dealers said. In early morning trade, New York main oil futures contract, light sweet crude for July delivery, dropped 71 cents to 133.90 dollars per barrel. The benchmark contract closed at 134.61 dollars a barrel on Monday after earlier spiking to an all-time high of 139.89 dollars during floor trading at the New York Mercantile Exchange.