Oil prices log minor gain ahead of supply data

    By Carla Mozee     Benchmark U.S. crude-oil futures logged modest gains in electronic trade Tuesday ahead of data that may show a weekly decline in crude stockpiles, extending a run of drawdowns.     Oil for September delivery CLU3 -0.15% , now the front-month contract, was up 13 cents at $107.08 a barrel.     Oil for August...