March RBOB prices trended higher overnight as they also tried to recover from Thursday's significant down wave. Some traders indicated that cash prices in the Midwest attracted support on news of a leak at a Sunoco plant in Oklahoma, but that did not appear enough to offset the impact of a surprisingly large build in US gasoline inventories. EIA gasoline stocks rose 4.443 million barrels, which was about two times greater than anticipated. The build pushed gasoline inventories at a 228,000 barrel surplus to year ago levels and 7.006 million above the five year average. Average total gasoline demand for the past four weeks was up 1.96% compared to last year. Gasoline imports came in at 722,000 barrels per day compared to 871,000 barrels the previous week.