How to read an EIA inventory report without mixing stocks and flows
The Weekly Petroleum Status Report, or WPSR, describes US petroleum supply using surveys and estimates. Before interpreting an inventory change, identify its reporting week, exact series, units and coverage. A stock draw is an observation, not a complete explanation of prices.
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Read the week-ending date separately from the release date, then the row and unit. Commercial crude excluding the Strategic Petroleum Reserve is not total crude including it. Stocks are volumes; production and refinery inputs are flows. Product stocks, refinery activity and balance adjustments add context but do not determine a price response.
What to check first
Record report edition, release date, week ending, table or series, geography, product, units and column period. Check whether crude excludes SPR, whether Cushing is already included, and whether a number is a stock level, change, daily rate or percentage.
What not to infer
A weekly draw does not prove stronger final consumption or predict the next oil-price move. Cushing is not an extra volume to add to national stocks, a balance adjustment is not a measured hidden cause, and monthly data do not automatically replace every weekly reading.
The archived WPSR released on 10 September 2026 covers the week ended 4 September 2026. These are different dates, not a measurement at publication time. It is a dated teaching example, not a current inventory update. EIA normally releases initial summary/data files after 10:30 a.m. US Eastern time on Wednesday, with other PDF/HTML material later. Holiday exceptions can change the day and time. Consult the schedule rather than assuming one permanent local-time conversion or identical availability for every format.
Appendix B describes sampled company reports, missing-response estimation and supplementary inputs. Weekly domestic production and exports have their own estimation methods; the report is not a complete physical census of every barrel. Monthly statistics offer broader historical coverage, but do not automatically rewrite each published weekly observation. EIA can revise weekly data when it considers the impact material. Distinguish a stated revision from production re-benchmarking or a later monthly comparison. Some appendix line references reflect older report layouts: follow current row names and notes.
The linked web supply table reports stocks in thousand barrels and other volumetric flows in thousand barrels per day. In contrast, Table 4 of the archived PDF reports stocks in million barrels. Refinery utilization is a percentage, not a volume. A balance-sheet stock-change row may be a daily rate, while the difference between two stock levels is a volume. Identify whether a column is the current week, prior week or a multiweek average before comparing it with another number.
Commercial crude excluding the US Strategic Petroleum Reserve, or SPR, is a separate category from strategic inventories. A broader crude total may already include both. Petroleum Administration for Defense Districts, or PADDs, are reporting regions. In the archived Table 4, Cushing is nested under Midwest PADD 2; Rocky Mountain is PADD 4. The superscript 4 beside Cushing is a footnote defining its Oklahoma tank-farm coverage, not its district. Do not add Cushing again to PADD 2 or the national commercial total.
Crude, gasoline and distillate stocks refer to different products. Refinery crude inputs describe material processed; utilization compares gross inputs with operable capacity. Neither directly counts retail fuel purchases. EIA's products-supplied measure is implied demand, not a direct survey of final consumption. Table 1 also includes production, trade, transfers, stock changes and an adjustment. Treat the adjustment as a balancing item, not proof of hidden production or missing demand. Timing differences and estimation complicate weekly interpretation; use the selected edition's named rows instead of an oversimplified equation.
Record the period, series, units, direction of change, related refinery/product/trade context and remaining uncertainty. EIA explains inventories as a buffer between supply and demand, with prices and expectations influencing inventory decisions as well as the reverse. A draw alone cannot identify its cause or the next price direction. Calling it unexpected also requires a separately identified prior expectation; the observation does not supply that forecast. This workflow supports document literacy, not an event-trading strategy or a conclusion about OPEC compliance.
Find the week ending, publication date and exact row. Record whether the column contains a level, a change or a multiweek average.
Units → coverage
Separate barrels from barrels per day, national totals from regional components, and commercial stocks from SPR. Keep each presentation's unit visible.
Evidence → uncertainty
Use refinery, product and trade rows to check a proposed explanation. An estimate, missing entry or adjustment should not become a confident causal claim.
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Are PDF and web inventory figures always displayed in the same units?
No. The archived PDF Table 4 uses million barrels, while the linked web table uses thousand barrels for stocks. Check each table heading and convert units before comparison. A daily flow also needs its time period.
Self-check: does the superscript 4 beside Cushing mean PADD 4?
No. Cushing is shown within Midwest PADD 2. The 4 is a footnote about tank-farm coverage. Rocky Mountain PADD 4 is a different district, and Cushing must not be added again to national stocks.
Does a lower crude-stock level prove consumers bought more fuel?
No. Production, trade, refinery activity, transfers and reporting differences can affect the balance. Crude inventories are not a direct measure of final gasoline or diesel purchases.
Are weekly figures replaced by monthly figures automatically?
No. The monthly system provides fuller historical information, while EIA has its own policy for materially important weekly revisions. A monthly comparison and a revision to a particular weekly series are different events.
Not by itself. It reconciles the reported balance and can reflect timing and estimation differences. Assigning the entire residual to one physical cause requires additional evidence.