Oil rose above $70 a barrel on Tuesday in a technical rebound after its 3.2 percent decline in the previous session, as traders watch for clues to the health of the global economy from a U.S. Federal Reserve meeting and a summit of G20 nations this week.

Oil's Monday fall followed a re-emergence of demand growth uncertainty in the wake of bearish comments from Asia's top oil refiner, Sinopec, that China's diesel demand remained depressed, while the International Energy Agency said world power output was likely to drop this year for the first time since 1945.

U.S. crude for October delivery rose 72 cents to $70.43 a barrel by 0822 GMT (4:22 a.m. EDT). The contract settled down $2.33 at $69.71 a barrel on Monday.

London Brent crude gained 62 cents to $69.31.

Its more of a technical rebound. There's no real news supporting oil's gains and its still very much trading sideways, said Clarence Chu, a Singapore-based trader with Hudson Capital Energy.

A more buoyant mood, helped by gains in the equities markets, may also have supported oil prices, analysts said.

Asian shares edged higher on Tuesday, helped by gains in South Korean technology shares, while European stock futures were up 0.9 percent and U.S. equity futures were nearly 0.7 percent higher.

Still, oil prices have largely been trading in the range of $67 to $73 in the third quarter and were unlikely to breakout without news of a substantial supply disruption or new evidence of a major recovery in energy demand, said John Vautrain, an analyst at Purvin & Gertz in Singapore.

Oil prices have doubled from their December lows of around $32 a barrel and struck a 2009 high of $75 a barrel in August, thanks to cross-asset ebullience following a stream of positive economic data.

But most analysts agree the fundamentals of supply and demand are still weak and most of the market optimism about a global recovery in energy demand has already been priced in.

China's gasoline exports jumped to their highest since early 2007 and diesel sales remained unexpectedly strong last month, data showed on Tuesday, fuelling concern that domestic demand in the world's No. 2 consumer is failing to keep up with record refinery production.

Analysts said the market will now keep a close watch on comments from the U.S. Federal Reserve meeting and the G20 summit for hints to the pace of the recovery.

The U.S. Federal Reserve begins a two-day monetary policy meeting on Tuesday and while it is likely to hold interest rates, markets will be watching for any comments indicating the Fed might wind back its super-accommodative policy stance in view of improving economic data. Such a move would boost the dollar, analysts said.

The Asian Development Bank on Tuesday raised its estimate of 2009 average growth in developing Asian economies to 3.9 percent from its March forecast of 3.4 percent, saying Asia had proved to be more resilient than expected to the global financial crisis.

(Reporting by Fayen Wong; Editing by Clarence Fernandez)