US Gas Prices & the SPR Buffer — 2026 Three-Scenario Forecast
AAA national-average pump price plus the Strategic Petroleum Reserve drawdown, side by side. Three paths to December: de-escalation, sustained standoff, or escalation. Today: $4.33/gallon for regular and $6.30 for diesel (AAA, 14 October), after a record $6.53 diesel on 22 September; SPR 283.0 million barrels (EIA, week ending 2 October), the lowest since 1982. At least nine named vessels were struck on 1-11 October (Kazimah III, Uhud, Lipsi, drone-funnel strike, On Peace, Acers off Qatar, a laden VLCC off the UAE, Valthera on 10 October, Angola Prosperity on 11 October, then GFS Pride (sunk), GFS Giselle, Al Saadiyat and Alfonso on 13 October); Trump rejected a renewed Iranian proposal around 1 October; US officials signal airstrikes probable after the November midterms (Axios). The G7 released 100 Mbbl of diesel and crude on 2 October. The strait remains effectively closed on Day 229.
Model note, 8 October 2026. The scenario weights (12% de-escalation / 45% sustained standoff / 43% escalation) were last revised on 8 September, after IRGC missiles targeted a US carrier group, US forces struck Iranian crude carriers, and Aramco’s Jazan refinery was hit. GEF reviewed them on 26 and 29 September and again on 5, 6 and 8 October and is holding them unchanged. The reason not to raise the de-escalation weight: Trump rejected a renewed Iranian proposal around 1 October, at least thirteen vessels were struck on 1-13 October, and US officials have signalled airstrikes probable after the November midterms even though Trump pledged on 8 October not to attack before 3 November. The reason not to raise the escalation weight further: the G7 released 100 Mbbl of diesel and crude through the IEA on 2 October (first 20 days diesel-weighted), Red Sea tanker loadings are rising at Yanbu, and Brent settled $106.06 on 14 October, up 0.4% on the day. The reason not to raise the escalation weight: the Saudi East–West Petroline restarted on 22 September after an 11-day halt, Yanbu is loading again at roughly half of pre-attack rates and Lloyd’s List reports Red Sea loadings rising. Brent settled $102.25 on Friday 2 October (round-trip week: $4.28 Thursday rally on China’s fuel-export suspension reversed by the G7 release). GEF will move the weights when ships move or a fresh strike lands, not on statements.
US gas prices and the Strategic Petroleum Reserve in 2026: observed to October 4, plus three forecasts to year-end
Two charts, same x-axis. The top chart is the AAA national-average price of regular — what most drivers pay. The bottom chart is the Strategic Petroleum Reserve — the federal emergency buffer that has absorbed part of the crude shock. The pump chart and the reserve chart were rebuilt on 12 October, both from their data tables. Regular climbed from $4.15 on 8 September to $4.48 on 28 September, then eased to $4.33 on 14 October after the G7 release. Diesel is the tighter fuel: it crossed $6.00 for the first time on 11 September, set a record $6.53 on 22 September, and was $6.30 on 14 October. The EIA week ending 2 October shows why: commercial crude drew 3.2 million barrels to 424.1 million, about 2% above the five-year average, while distillate drew again to 105.2 million, about 13% below it. The crude is available; the refined product is not.
GEF’s own AIS reading is the reason not to overreact to headlines in either direction: on 10 October GEF’s Bandar Abbas and Qeshm frame showed only a single satellite-AIS contact near Bandar Abbas, in the same corridor where tankers were struck on 1-6 October. A reopening plan on paper has not yet become traffic. The SPR is at 283.0 million barrels (week ending 2 October), about 33 million above its ~250 million operational floor, after a 0.8 million barrel draw in the latest week.
December 2026 endpoint range — AAA national average ($3.80 de-escalation → $6.10 escalation, base case $4.60)
Today (14 October AAA) — observed
$4.33
AAA national average for regular, 14 October 2026, plotted as the last point on the chart below (about 4 cents below the 5 October read of $4.37, and 15 cents below the 28 September $4.48). Beside it, diesel at $6.30 (AAA), 23 cents below the record $6.53 set on 22 September. Brent settled $106.06 and WTI $95.09 on Wednesday 14 October. Crude has risen again since the G7 release, but the pump has not followed yet, because distillate stocks are about 13% below the five-year average and gasoline stocks drew 1.7 million barrels in the week ending 25 September.
Scenario 1 — De-escalation
$3.80
OPTIMISTIC CASE (~12%). A version of Iran’s seven-day plan, or another deal, is agreed and tankers actually transit Hormuz again; Brent falls back toward the $80s. The pump price eases from $4.33 but stays well above the $2.98 pre-war level, because diesel and product stocks take months to rebuild. Year-end ~$3.80.
Scenario 2 — Sustained high-tension standoff
$4.60
BASE CASE (~45%). Talks continue without a verified reopening, strikes stay intermittent, and Brent holds roughly $95–110. The pump price holds near today’s $4.33 and edges up into winter as heating-oil demand competes for distillate. Year-end ~$4.60.
Scenario 3 — Escalation
$6.10
ELEVATED TAIL RISK (~43%). A further strike on Gulf export infrastructure, a Red Sea attack on Saudi shipping, or a collapse of the diplomatic track pushes Brent toward $120+. The SPR falls through its ~250 million barrel operational floor. Year-end ~$6.10 — well above the 2022 record.
Reference: 2022 historical peak
$5.00 / gal June 2022, one-week record
The 2022 peak (Russia–Ukraine plus post-COVID demand) is the ceiling regular has stayed under in 2026 so far — the high was $4.55 on 21 May. Diesel has already broken its own 2022 record ($5.81): $6.53 on 22 September.
Reference: SPR operational floor
~250 mbbl salt-dome hydraulic limit
Below ~250 mbbl, the four Gulf-coast salt-dome sites cannot sustain maximum-rate withdrawals (brine-displacement geometry). Currently 283.0 mbbl (EIA, week ending 2 October, the lowest since 1982) — about 34 mbbl above the floor. The escalation scenario takes it below the floor by December.
The headline number. What drivers pay. Y-axis $3 to $7; the 2022 historical peak of $5.00 marked as a dashed reference; the pre-conflict baseline of $2.98 visible at the chart floor.
Chart 2 — Strategic Petroleum Reserve, million barrels
The buffer mechanic. As the SPR depletes toward its ~250 mbbl operational floor, its capacity to muffle crude spikes weakens. The lower the SPR sits, the steeper the corresponding pump-price scenario above.
FebMarAprMayJunJulAugSepOctNovDec
AAA pump price — observed
SPR inventory — observed
Scenario 1: De-escalation (~12%)
Scenario 2: Sustained standoff — base case (~45%)
Scenario 3: Escalation tail (~43%)
Forecast model · GEF supply-chain analysis · pump prices from AAA national averages · SPR levels from EIA Weekly Petroleum Status Report · scenarios are illustrative, not guarantees · both charts rebuilt 8 October 2026 from their data tablesglobal-energy-flow.com · October 8, 2026
Current state, 15 October 2026 (Hormuz Day 229). Both observed lines now run to the latest data: the pump chart to the AAA read of 11 October, the SPR chart to the EIA week ending 2 October. Diesel is the fuel under the most pressure: a record $6.53 a gallon on 22 September ($6.30 on 7 October after the G7 release and $6.30 on 14 October, AAA), above the June 2022 peak of $5.81, with distillate stocks about 13% below the five-year average and the heating season ahead. The EIA projects distillate stocks stay below their five-year low through much of 2027. On the evidence to date the regular-gasoline track sits between the base-case and escalation bands, not in the de-escalation band.
Reading the chart. The solid lines are observed. The top chart shows the AAA national average for regular rising from $2.98 on 26 February, before the strait closed, to a peak of $4.55 on 21 May, falling to a $3.79 low on 7 July, then climbing through the late-summer escalations to $4.48 on 28 September before easing to $4.33 on 14 October after the G7 release. The bottom chart shows the Strategic Petroleum Reserve falling from about 415 million barrels at the start of the war to 283.0 million in the week ending 2 October — a draw of about 132 million barrels and the lowest level since 1982. The latest weekly draw was 0.8 million barrels. The three dashed paths bracket what happens between now and year-end. In the escalation path, the SPR crosses its operational floor at the same time the pump price moves past the 2022 record: the next supply shock would land on the thinnest US buffer in four decades.
Scenario 1De-escalation — a reopening deal is agreed and ships move. Optimistic case (~12%). Iran’s seven-day plan of 25 September, or a revised version, is accepted, sanctions and blockade are eased in sequence, and tanker traffic through Hormuz resumes in verifiable numbers. Brent falls toward the $80s. The SPR draw stops and a partial refill begins in Q4, ending near 325 million barrels. Regular eases from $4.33 but does not return to the $2.98 pre-war level: product stocks, especially diesel, take months to rebuild, and insurers will price the strait cautiously for some time. Year-end near $3.80.
Scenario 2Sustained high-tension standoff — talks continue, the strait stays shut. Base case (~45%). This is the pattern of the last six months: plans and pauses, followed by fresh strikes, with no verified reopening. The Petroline bypass builds back toward 4 million barrels a day but Yanbu loadings stay constrained. The SPR keeps drawing slowly, ending December around 265 million barrels. Regular holds near $4.49 and edges up as winter distillate demand competes with diesel for refinery output. Year-end near $4.60.
Scenario 3Escalation — a further strike on Gulf export capacity or Red Sea shipping. Elevated risk (~43%). A strike that takes the Petroline or Yanbu offline again, a successful Houthi attack on Saudi shipping in the Red Sea, or a collapse of the diplomatic track pushes Brent toward $120+. The SPR drawdown accelerates and falls through the ~250 million barrel operational floor by December, where salt-dome hydraulics force slower withdrawals just as the shock peaks. Regular climbs well past the 2022 record, ending near $6.10. This is the path that would put export restrictions back on the table: a 90-day diesel export ban was already floated and denied in the week of 21 September.
SPR mechanicWhy the buffer is the right thing to watch. The Strategic Petroleum Reserve does not set prices, but it is Washington’s most direct lever on the crude that refiners buy. The four salt-dome sites in Texas and Louisiana hold up to ~714 million barrels at design capacity; the operational floor — below which oil can still be drawn, but not at full rate — sits around 250 million barrels, set by the brine-displacement geometry of the caverns, not by policy. Above the floor, released barrels lower refiners’ feedstock cost and reach the pump with a one-to-two-week lag. Below it, the draw rate is capped and crude moves into pump prices more directly. At 283.0 million barrels (week ending 2 October) the reserve is about 40% full and about 33 million barrels above the floor. The latest weekly draw was 0.8 million barrels, which buys time; an escalation would force them back up. The SPR also cannot fix the diesel problem directly: it holds crude, and the shortage is in refined product.
State extremesWhat gas costs across the country today. Beneath the $4.33 national average sits a regional spread of more than $2 a gallon, structured by state taxes, environmental specifications (California’s CARB-spec gasoline costs more to refine), refining capacity and pipeline access. Figures below are AAA state averages for regular, 11 October 2026; the lower column shows the cheapest of the states GEF tracks on the US page.
Most expensive (AAA, 11 Oct)
California$6.31
Hawaii$5.64
Washington$5.45
Nevada$5.44
Alaska$5.02
Least expensive tracked (AAA, 11 Oct)
Georgia$3.81
Texas$3.82
Ohio$3.89
Indiana$3.92
Mississippi$3.93
The California–Indiana spread of $2.35 a gallon is about half the national average — structural, and it persists across crude-price environments. In Scenario 3 the spread widens further, because CARB-spec states with fewer supply options absorb a larger share of any increase. Diesel runs higher still: $8.44 in California. For continuously updated state prices, see AAA’s state gas-price averages.
MethodThis is a scenario forecast, not a prediction. The observed pump-price line is built from AAA national averages for regular; the observed SPR line is from EIA Weekly Petroleum Status Reports. The dashed branches to year-end are illustrative paths, and the weights (45% base / 12% de-escalation / 43% escalation, set 8 September and held on 26 Sep, 29 Sep, 5 Oct and 8 Oct) are GEF’s judgement, not a probabilistic model. The outcome depends on whether Hormuz actually reopens, refinery uptime, the pace of SPR draws, and winter weather. Pump chart, reserve chart and text refreshed 8 October 2026. Sources: AAA Fuel Prices (national average 7 October; state averages 28 September; diesel record 22 September); EIA Weekly Petroleum Status Report (week ending 2 October, released 7 October: commercial crude 424.1 million barrels, distillate 105.1 million, gasoline 204.7 million; SPR 283.0 million barrels for the same week, released 7 October); Brent and WTI settles for 28 September and 2, 5, 6 and 7 October (EnergyNow, Rio Times, Trading Economics); Reuters and Zawya on the Petroline restart and Yanbu loadings; reporting on Iran’s seven-day plan, Trump’s rejection (26 September) and his later rejection of a renewed proposal (1 October); Seatrade, TradeWinds and Riviera on the four tanker strikes 1-4 October; The National and Washington Post on the G7 100 Mbbl release (2 October); Lloyd’s List on rising Red Sea tanker loadings; Axios (2 October) on airstrikes signalled after the midterms; GEF’s own AIS chokepoint reading (8 October). Per-disruption detail and the live US shortage map are at global-energy-flow.com/shortages/united-states/.