* U.S. oil product stocks jump more than expected
* IEA lifts demand forecast, but emphasizes economic risk
* Coming up: U.S. weekly jobless claims, Thursday (Updates market activity and adds settlement prices)
NEW YORK, Aug 11 (Reuters) - Oil fell more than 3 percent on Wednesday, its biggest drop in six weeks, as a rise in U.S. gasoline stocks exacerbated a sell-off triggered by slower Chinese output growth and a downbeat economic outlook from the Federal Reserve.
Gasoline prices led the decline, dropping for the fifth time in six days. In a sign of unusually weak summer demand, gasoline's premium to crude narrowed to less than $6 a barrel for the first time since December after weekly inventory data showed stocks rising even as refiners slashed output.
The rise in U.S. refined product stocks overshadowed the bigger-than -forecast 3 million barrel draw in crude stocks, as well as a slight upgrade in the outlook for global oil demand growth from the International Energy Agency.
U.S. crude for September <CLc1> delivery fell $2.23, or 2.78 percent, to settle at $78.02 a barrel. Total trading volume came to more than 700,000 lots after the settlement, well above the average of 555,000 lots over the past 30 days.
In post-settlement electronic trade, crude had fallen as low as $77.42 by 4:30 p.m. (2030 GMT).
Front-month ICE Brent crude <LCOc1> fell $1.96 to settle at $77.64.
September RBOB gasoline <RBc1> fell 8.77 cents, or 4.21 percent, to settle at $1.9976 a gallon, while September heating oil <HOc1> fell 2.36 percent.
Prices traded in tandem with slumping U.S. equity markets and a surging dollar through most of the day. Data showing slower growth in Chinese investment and factory output [
] fed early losses that accelerated as traders grew more anxious about the risk of a double-dip recession.The U.S. S&P 500 stock index <.SPX> fell 2.6 percent and the U.S. dollar index <.DXY> surged by nearly 1.8 percent as the Chinese data plus Tuesday's Fed comments about a sluggish recovery fueled worries about the economy and drove investors to sell riskier assets. [
] [ ]Oil prices took an additional hit from weekly government oil stock data showing refined products inventories rose more than expected in the week to Aug. 6 despite a sharp 3.1 percentage point drop in refinery utilization. [
]"One thing to take from the report was the larger-than-expected gain in products despite lower refinery rates, which shows how poor demand is in the United States," said Mike Zarembski of OptionsExpress in Chicago.
Gasoline inventories rose 400,000 barrels, more than expected during summer, when stocks normally decline, leaving the premium to year-ago levels at 11.5 million barrels. The EIA also reported a 3.5 million barrel rise in distillate stocks.
Most of the nationwide decline in crude oil stocks was concentrated in the Midwest PADD 2 region. This includes refiners that have been forced to curtail runs due to a more than two-week closure of a small but key Enbridge pipeline.
Stocks fell by 2.4 million barrels from the previous week's record high, although refinery crude runs dipped by less than one percent, according to the data. [
]Oil demand readings from China, the world's No. 2 consumer, showed growth slowing to a modest 2.2 percent in July versus a year ago, and down 6 percent from June. [
]While the IEA monthly report slightly increased forecasts for global crude demand for 2010 and 2011, it warned any rise in fuel consumption could be wiped out if the global economy proved weaker than expected, [
]The market was unmoved by Tropical Depression Five in the eastern Gulf of Mexico, which could dissipate as it moves toward eastern Louisiana, the U.S. National Hurricane Center said. [
]There had been no reports of oil or natural gas output cuts or platform evacuations due to the tropical depression, government officials said. [
] (Reporting by Robert Gibbons, Gene Ramos and Edward McAllister in New York and David Turner in London and Florence Tan; Editing by David Gregorio)