After a weak start Tuesday evening, April RBOB prices turned into positive territory. US gasoline prices appear tightly linked to the action in Brent crude oil, which has gained nearly 1% during the early morning action. Expectations for this morning's EIA inventory report are for US gasoline supplies to have declined by around 750,000 barrels last week. There also appears to be growing concerns with the recent rise in gasoline prices, and their potential negative impact on already sluggish US demand.