* Rally fed by talk of economic stimulus loses steam
* Firmer U.S. dollar adds pressure
* Coming Up: U.S. industrial output for Sept; 1315 GMT
(Updates throughout, previous SINGAPORE)
By Joe Brock and Isabel Coles
LONDON, Oct 18 (Reuters) - Oil on Monday hit its lowest in a week, below $81 a barrel, pressured by uncertainty over the U.S. economic outlook and as the battered dollar rallied.
Federal Reserve chief Ben Bernanke cemented expectations of more U.S. monetary easing on Friday but his comments lacked detail, raising doubts over the impact the measures will have on the economy of the world's largest fuel consumer.
U.S. crude for November <CLc1> fell 74 cents to $80.51 by 0841 GMT, extending last week's drop of 1.7 percent. It touched $80.30 on Oct. 8, the lowest price since the beginning of the month, after reaching a five-month high of $84.43 a day earlier. December ICE Brent <LCOc1> fell 72 cents to $81.73.
The U.S. dollar bounced from a 10-month low against a basket of currencies on Monday, as investors trimmed bearish bets against the greenback on some uncertainty how much easing the Federal Reserve will implement. <.DXY>
A stronger dollar makes commodities, like oil, more expensive for buyers using alternative currencies.
U.S. Federal Reserve Chairman Ben Bernanke on Friday offered his most explicit signal yet that the U.S. central bank was set to ease monetary policy further in a debt purchase programme described as a second round of quantitative easing, or QE2.
Oil pierced the upper end of a $70-$80 trading range this month that had held for much of the last year, on optimism a boost to the U.S. economy would improve weak fuel demand but the rally fizzled out at the end of last week.
"It looks like we are revising down the possible impact of QE2 and I think prices will return to the $70-$80 range in the coming days or weeks," said Christophe Barret, oil analyst at Credit Agricole.
The Fed next reviews policy on Nov. 2-3, when details about any stimulus moves and their implementation could emerge.
U.S. industrial output numbers will be carefully eyed later on Monday after data at the end of last week highlighted the fragile state of recovery in the world's largest economy.
U.S. inflation unexpectedly slowed in September, despite a pickup in retail sales, the government said on Friday. A survey showed the country's consumer sentiment unexpectedly dipped in early October to its weakest level since July. [
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DOLLAR DRIVES MARKET
The dollar strengthened by almost 0.5 percent against a basket of currencies on Monday, extending Friday's gains from 10-month lows. Technical indicators pointed to the possibility of a further short-covering rebound. [
]In France, President Nicolas Sarkozy faces a make-or-break week for his unpopular pension reform as rail and refinery workers, truck drivers and street protestors ramp up pressure to scrap it before a crucial Senate vote.
A three-week old strike at the French oil hub of Fos-Lavera is blocking 61 ships from unloading cargo, the port authority said on Sunday. [
]"Everybody will be looking at the developments in France to understand whether or not they will renew supply of fuel in the coming days or not, I think that is really the main element and the main uncertainty in the market right now," Barret said.
Key oil producer Saudi Arabia is holding a conference in Riyadh on Monday to mark the 50th anniversary of the Organization of the Petroleum Exporting Countries (OPEC), which the kingdom's oil minister Ali al-Naimi is scheduled to attend.
OPEC secretary general Abdullah al-Badri said on Friday that and oil price between $75-$85 would not hinder global economic recovery but said the group was concerned about the value of the dollar. [
] (Editing by Keiron Henderson)