Brent crude futures eased on Tuesday, giving up early gains, as investors weighed the chances that global supply will increase substantially if OPEC decides this month to raise output, just as U.S. production grows at near-record rates.  Brent crude futures LCOc1 fell 11 cents to $75.18 a barrel by 0924 GMT, having lost 2 percent the previous day. U.S. West Texas Intermediate crude CLc1 edged up 30 cents to $65.05. “(The output decision) is going to be the main event of the month and the main input for the second half of the year, so any change in OPEC policy is a big event,” Petromatrix strategist Olivier Jakob said. Fund managers this year racked up a record bet on a continued rise in oil prices, but the sustained increase in […]