* Equities drop, dollar rises after U.S. home sales data
* EIA data shows surprise gasoline build
* OPEC supplies may increase even without target change
(Updates prices)
By Joe Brock
LONDON, Oct 28 (Reuters) - Oil fell more than 2 percent to below $78 a barrel on Wednesday after a U.S. inventory report showed a surprise build in gasoline stocks, increasing doubts over demand from the world's largest fuel consumer.
U.S. crude for December delivery <CLc1> fell $1.88 to $77.67 a barrel by 1:07 p.m. EST (1707 GMT), after settling up 87 cents on Tuesday, its first rise in four days. London Brent crude <LCOc1> fell $1.79 to $76.13 a barrel.
U.S. crude oil inventories rose less than expected last week as imports increased but gasoline stockpiles logged a surprise gain, according to data from the U.S. Energy Information Administration (EIA). [
]U.S. weekly gasoline stockpiles were up 1.7 million barrels at 208.6 million barrels, the EIA said, compared with analysts' forecasts of a draw of 800,000 barrels.
"Crude stocks were only up 800,000 but the surprise was gasoline stocks. I think that's what is keeping the market down," said Dan Flynn, analyst at PFGBEST Research in Chicago. Oil prices were already under pressure after economic data showed an unexpected fall in U.S. new home sales, raising new doubts over the strength of economic recovery. [
]U.S. and European equity markets fell following the release of the data as analysts questioned the sustainability of the markets' seven-month rally. [
]DOLLAR STRENGTH
The dollar strengthened against a basket of currencies <.DXY>, adding pressure to oil prices. As the dollar rises, dollar-denominated crude becomes more expensive for holders of other currencies.
"The correlation with the dollar and equities has been going for some time and is still very much in play, they are all moving in close step," Simon Wardell, oil analyst at Global Insight, told Reuters.
U.S. crude had risen more than 1 percent on Tuesday after alternative data from the American Petroleum Institute data showed U.S. crude stocks fell by 3.5 million barrels last week, compared with a forecast for a 1.8 million barrel build in a Reuters poll.
The data also indicated, however, that U.S. gasoline and distillate supplies fell less than expected. [
]OPEC oil ministers said this week the producer group might raise output at a meeting in December if prices continued to rise and global crude stocks fell fast as group members were nervous about unsustainable gains in oil prices.
Analysts said they expected OPEC supplies to increase even without an official change to the group's output target, which would be likely to moderate oil price rallies.
"It may be difficult for OPEC to gain consensus on higher output, without higher prices, but that does not mean that we will not have higher output," Lawrence Eagles, analyst at JP Morgan said. (Editing by Marguerita Choy)