U.S. oil production hit another record in September, but the bigger story in this month’s Petroleum Supply Monthly is what isn’t in the report: actual export data. Because the U.S. Census Bureau couldn’t release September trade figures during a funding lapse, the EIA had no choice but to recycle August’s export numbers and paste them into September’s balance sheet. That one missing piece ripples through nearly everything analysts try to read from the monthly series — from product supplied to implied demand to…