Energy firms Exxon Mobil Corp XOM.N, Schlumberger NV SLB.N, Marathon Oil Corp MRO.N, Occidental Petroleum Corp OXY.N and Halliburton Co HAL.N fell between 0.3% and 0.8%, tracking crude prices. By Devik Jain and Ambar Warrick Aug 11 (Reuters) - Wall Street's main indexes were set to open slightly higher on Wednesday after data showed that growth in inflation appeared to have peaked, while economically sensitive stocks gained on the passing of a infrastructure bill. Data showed U.S. consumer prices rose 0.5% last month after climbing 0.9% in June, amid continued supply-chain disruptions and stronger demand for travel-related services.