The API late yesterday reported a 3M barrel build in domestic supplies, a number the EIA is expected to confirm in its own report at 10:30 ET.
WTI crude (USO) is off 1.9% to $96.48, the lowest price since late June. Brent crude (BNO) isn't off nearly as much and the spread between the two has widened to a 6-month high of about $12 per barrel.
Behind the stock build and lower U.S. prices could be refinery maintenance shutdowns. Fewer runs mean lower demand for crude, but also mean less product - gasoline and distillate supplies are both expected to print lower in the EIA report.