An oil headline can sound like a warning for your next fill-up. But this week offers a useful reminder: different petroleum inventories can move in opposite directions.
EIA’s October 7 release covers the week ending October 2, 2026. Commercial crude stocks decreased, while total motor gasoline stocks increased. Neither observation tells us exactly what your local station will charge next. EIA Weekly Petroleum Status Report.
Want to plan without guessing the market? Try your numbers with Piggy. The preset starts with 12 gallons weekly; change “Units per purchase” to 15 to follow the example below.
What changed this week?
These are U.S. national inventories, in million barrels, comparing October 2 with September 25—not Los Angeles station prices.
| Inventory series | September 25 | October 2 | EIA-reported change |
|---|---|---|---|
| Commercial crude, excluding SPR | 427.3 | 424.1 | −3.2 |
| Strategic Petroleum Reserve | 283.8 | 283.0 | −0.8 |
| Total motor gasoline | 204.4 | 204.7 | +0.4 |
| Distillate fuel oil | 105.2 | 105.1 | 0.0, rounded |
EIA calculates changes using unrounded figures, so subtracting displayed values can produce a slightly different result. Total motor gasoline also includes blending components; it is not simply finished regular gasoline ready at the pump. EIA Tables 1 and 9.
The supply picture includes refinery activity, too. Refineries processed approximately 16.5 million barrels daily, up 223,000 barrels daily, with utilization at 92.7%. These operating measures add context; they do not establish a household price forecast. EIA weekly summary.
Keep the different “reserves” separate
The SPR is federally managed stored crude oil. DOE’s inventory graphic shows 283 million barrels as of October 2, matching EIA’s rounded figure for that week. This is separate from commercial crude inventories and refined-product inventories. DOE SPR information, dated inventory graphic.
Underground proved crude reserves are a different concept: estimated oil recoverable from known reservoirs under existing economic and operating conditions—not barrels already sitting in storage tanks. EIA reserve definitions.
Do not add these measures together as though they were one interchangeable fuel supply.
A headline is context—not a cents-per-gallon formula
Gasoline prices reflect crude costs, gasoline supply and demand, refinery operations, transportation disruptions and seasonal specifications. One national inventory change cannot reliably translate into a specific price change at your station. EIA gasoline price explainer.
Piggy’s approach is simpler: choose a scenario, calculate its effect, and keep the assumption visible.
What would a 70¢ rise mean for you?
Here is an explicitly hypothetical U.S. example—not a current station quote or a forecast.
Use USD and the same regular gasoline grade. The previous tax-inclusive price is $5.00 per U.S. gallon, and the scenario price is $5.70 per gallon, with consistent discount treatment. Assume 15 gallons, once weekly.
The difference is: $0.70 × 15 = $10.50 more weekly.
Using the calculator’s 52-week annualization, that becomes $45.50 more per average month, or $546 annually if price and usage stay unchanged.
There is an important distinction between a price increase and a budget gap. This example moves the monthly projection from $325 to $370.50. Against a chosen $360 monthly target, the projected gap is $10.50—not $45.50.
Neither number is recorded spending.
What if the price drops instead?
Change the scenario price to $4.60, keeping the same usage. The projection decreases by $6 weekly, $26 per average month, or $312 annually.
That is a potential expense reduction, not money already saved. Actual savings require the lower spending to happen—and the difference to remain available.
Protect essential travel when considering adjustments. Optional expenses elsewhere may offer more flexibility. And do not automatically raise a grocery forecast by a percentage derived from gasoline: compare actual food prices separately.
Piggy does not need a crystal ball. Just clearly labeled assumptions and a little room to plan.
Try a higher or lower fuel price with Piggy. Set gallons to 15 for this example, or enter your own quantity, frequency and comparable prices. The calculator tests one cost comparison; it does not forecast oil markets or upload receipts.
Sources and coverage
- EIA: Weekly Petroleum Status Report, October 7 release
- EIA: Tables 1 and 9, week ending October 2, 2026
- EIA: Weekly Petroleum Status Report summary
- DOE: SPR Quick Facts
- DOE: SPR inventory graphic as of October 2, 2026
- EIA: Proved crude oil reserve definitions
- EIA: Gasoline price fluctuations
- EIA: Retrieved Weekly Petroleum Status Report errata
Sources checked October 7, 2026. EIA release: October 7; inventory observations: October 2, compared with September 25. DOE’s inventory graphic is dated as of October 2, with no separate publication date displayed. EIA’s gasoline explainer was last updated September 6, 2024 and is used for background, not current prices. The retrieved EIA errata page concerns 2023 propane data; no relevant October correction was identified there. Weekly estimates may be revised. This is a dated national-inventory snapshot, not a live feed, local station quote or pump-price forecast. All household prices and usage are hypothetical, and annualization assumes unchanged inputs for 52 weeks.
A little clarity, not a guarantee
Projections are not recorded spending or confirmed savings. No national average or future price is inferred. The web calculator does not upload receipts, send family requests, or update the iPhone app.