Reuters | Oil prices edge lower on concerns about demand Reuters Despite record demand from drivers across the United States, an excess of gasoline worldwide has weighed on refineries' profitability, leading some to cut runs and throwing the demand for crude oil in doubt. Investors also awaited data on U.S. crude ... US oil plunges 4.9 pct, ends at $46.60, on economic jitters Oil Prices Continue to Tumble on Concerns Over Global Growth Prospects Why An Oil Price Crash Remains Unlikely |