* U.S. gasoline demand up, stocks fall
* Crude, middle distillate inventories rose
* U.N-Iran nuclear talks on Thursday (Recasts, updates prices, market activity; new byline, dateline, previously LONDON)
By Edward McAllister
NEW YORK, Sept 30 (Reuters) - Oil surged over 4 percent toward $70 a barrel on Wednesday, buoyed by a drop in U.S. gasoline inventories and a weak dollar.
U.S. government weekly oil data showed gasoline inventories dropped 1.6 million barrels, in line with separate figures from industry group American Petroleum Institute but contrary to forecasts by analysts who had expected an increase.
Gasoline demand over the past four weeks was up by more than 5 percent. [
] [ ]U.S. crude futures <CLc1> were up $2.87 to $69.58 a barrel by 1:08 EDT (1708 GMT). London Brent crude <LCOc1> gained $2.62 to $68.11 a barrel.
"The real surprise was the draw on gasoline stocks. It's certainly a positive sign for gasoline prices and implied gasoline demand is also up," said Addison Armstrong, director of market research with Tradition Energy in Connecticut.
He and other analysts said inventories of crude oil and middle distillates, such as heating oil and diesel, rose and demand for such oil products overall still remained weak.
Crude oil inventories increased by 2.8 million barrels last week, surpassing analysts' forecast for a 600,000 barrel rise. The increase in middle distillate inventories was smaller than expected, but demand over past four weeks was more than 9 percent lower than a year earlier.
"The report is actually mixed," Olivier Jakob with Swiss-based Petromatrix said. "Overall inventories increased and keep building up."
Given that overall oil demand remained slack, the U.S. dollar and equities may come back to influence the oil market, Jakob said.
U.S. equities moved into positive territory in early afternoon, bouncing back from news of a surprise fall in business activity in the U.S. Midwest, including Chicago.
Further support came from a weak dollar, which makes crude more affordable for buyers using other currencies.
Political tensions related to Iran, OPEC's No. 2 producer, added support, analysts said, ahead of a meeting between diplomats from the five permanent U.N. Security Council members as well as Germany and Iran's nuclear negotiator [
].(Additional reporting by Ikuko Kurahone, Christopher Johnson; Editing by David Gregorio)