Oil futures edged lower on Wednesday amid speculation that a last-minute deal over Iran’s nuclear program would be reached that could allow more Iranian crude into world markets. Talks between Iran and six world powers to settle a dispute around Tehran’s nuclear program extended beyond a Tuesday deadline, as the parties edged towards a deal but failed to agree on crucial details such as the lifting of U.N. sanctions. Brent crude for May delivery (LCOc1) was down 10 cents at $55.01 a barrel by 1.12 a.m. ET, after settling down $1.18 on Tuesday.