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US gasoline tops $4 on Labor Day for first time as Iran war tightens fuel supply

US gasoline tops $4 on Labor Day for first time as Iran war tightens fuel supply

Built World Grand Rapids, MI local

Diesel hits a record $6.40 and gas climbs to $4.44 as Trump says he hopes the Iran war is nearing an end

September 17th, 2026: Diesel hits record $6.40 as gas rises to $4.44

Overview

Updated Sep 17

Gasoline averaged $4.44 a gallon on Sept. 17, up 39% from a year ago; diesel hit a record $6.40, up 73%. President Donald Trump said he hoped an end to the war against Iran was near, even as Houthi fighters escalated attacks on Saudi Arabia.

The supply crunch has not let up. Brent crude topped $109 a barrel, and Saudi Arabia's East-West Pipeline stayed shut after an attack on Sept. 11. The Strait of Hormuz is moving only a handful of tankers a day.

Why it matters

Fuel moves everything in the US economy, and diesel at $6.40 pushes the cost of every trucked good into store prices.

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Key Indicators

$4.44/gal
Average US gasoline price
National average on Sept. 17, up from $4.31 on Sept. 14 and $3.20 a year ago.
$6.40/gal
Average US diesel price
Record set Sept. 17, up 73% from a year ago. Diesel powers most freight and doubles as heating oil.
98%
Refinery utilization rate
Highest since 2018, leaving almost no spare capacity to boost fuel supply.
205.7M barrels
US gasoline inventories
Below the five-year August average of 217.6 million barrels.
$109+
Brent crude per barrel
Surged past $109 in mid-September, up from $101.58 on Sept. 9. Prices slipped as Saudi Arabia offered extra cargoes via Oman.
9-14 vessels/day
Strait of Hormuz vessel traffic
Daily transits ranged from nine to 14 ships in mid-September, a small fraction of pre-war levels.

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Timeline

February 2026 September 2026

15 events Latest: September 17th, 2026 · 1 month ago Showing 8 of 15
Tap a bar to jump to that date
  1. Diesel hits record $6.40 as gas rises to $4.44

    Latest Market

    AAA reports diesel up 9 cents overnight to $6.40, up 73% from a year ago, and gas up 7 cents to $4.44. GasBuddy's Patrick De Haan says 44 states now have record diesel prices.

  2. Trump says he hopes Iran war nearing an end

    Conflict

    Trump said he hoped an end to the war against Iran was near as Houthi fighters launched drones and missiles at Saudi cities. He is set to meet Middle East leaders at the UN; Houthis released footage said to show a wrecked Saudi F-15.

  3. Trump calls gasoline spike a 'small price' to pay

    Political

    Trump said the gasoline spike is a small price to pay for the Iran war. AAA data showed gas rising from $4.31 to $4.43 in four days.

  4. Fed hike odds top 90% ahead of Sept. 16 meeting

    Economy

    Markets price in a greater than 90% chance the Federal Reserve raises rates for the first time since 2023.

  5. Gas hits $4.31, diesel $6.23; Treasury yield tops 5%

    Market

    AAA reports gas at $4.31 and diesel at a record $6.23 on Monday. The 10-year Treasury yield briefly topped 5% for the first time since 2023, and Brent surged past $109. Hormuz traffic fell to as few as nine vessels a day.

  6. Saudi Arabia shuts East-West Pipeline after attack

    Market

    The Saudi Energy Ministry shut the East-West Pipeline 'as a precautionary measure' after an attack. The line can carry up to 7 million barrels a day and became critical once Hormuz traffic nearly stopped.

  7. Iran and US trade heaviest shipping attacks of the war

    Conflict

    Iran says it attacked 10 ships near the Strait of Hormuz after the US sank five Iranian oil tankers. A seafarer was killed and oil jumped past $100 a barrel.

  8. Diesel sets record at $5.94 as Brent tops $100

    Market

    AAA reports diesel at an all-time high of $5.94 on Wednesday; Brent crude hits $101.58.

  9. Gasoline hits record $4.15 on Labor Day

    Market

    AAA reports the national average at $4.15 on the holiday, the first time gas has topped $4 on Labor Day. Diesel sits at a record $5.85.

  10. Forecast: Gasoline to top $4 on Labor Day for first time

    Market

    GasBuddy's Patrick De Haan projects the national average will hit $4.03, beating the 2012 record of $3.83 on the holiday weekend.

  11. Diesel hits record $5.85 a gallon

    Market

    The highest diesel price on record, up from about $3.76 before the war began.

  12. Gasoline averages $4.13, inventories fall

    Market

    EIA reports gasoline stocks at 205.7 million barrels, below the five-year August average.

  13. Ukraine hits Russian refineries

    Conflict

    Repeated drone attacks tighten global fuel supplies on top of the Hormuz closure.

  14. Iran shuts Strait of Hormuz

    Conflict

    Crude oil traffic through the key waterway plunges; Iran refuses to reopen it.

  15. US and Israel launch strikes on Iran

    Conflict

    The attack starts a war that cuts off the Strait of Hormuz to normal tanker traffic.

Scenarios

1

Ceasefire reached, Strait of Hormuz reopens, gasoline falls under $3.50

Possible Resolves by Q1 2027

Discussed by: Analysts quoted by Reuters and AP News frame Hormuz reopening as the main path to lower prices.

A ceasefire or de-escalation lets Iran reopen the waterway to tanker traffic. Crude supply normalizes, refining margins ease, and pump prices drift down over several weeks. Tom Seng at Texas Christian University notes this is the clearest trigger, though he flags other factors that could keep prices elevated.

2

Winter heating crisis: gasoline stays above $4, diesel tops $6

Possible Resolves by End of 2026

Discussed by: TT News and AP flag diesel's role as heating oil in Northeast states, including swing-district Maine.

If the Strait stays closed into winter, diesel and heating oil keep climbing since they are nearly interchangeable. Freight costs push into food and retail prices. The highest share of Maine homes heats with oil, giving the issue direct political weight in an upcoming Senate race.

3

Federal Reserve raises rates as fuel inflation grips the economy

Possible Resolves by End of 2026

Discussed by: Traders quoted by TT News see about a 50-50 chance of a rate hike when the Fed meets in mid-September.

With broader inflation climbing on fuel costs, the central bank tightens policy. That raises borrowing costs at a moment when households already pay more at the pump. A hike would signal the Fed views the fuel shock as entrenched rather than temporary.

4

Tanker war widens, oil holds above $100 into October

Deadline passed (Oct 15, 2026)

Discussed by: Reuters and Time reporters covering the Sept. 9 attacks

If the US-Iran tanker attacks continue, shipping through the Strait of Hormuz stays near zero and crude prices hold above $100. Diesel and gasoline keep setting records, and the Fed's rate hike does little to cool fuel inflation.

5

UN diplomacy yields a ceasefire framework

Deadline passed (Oct 15, 2026)

Discussed by: Axios via Reuters; Trump says he hopes the war is nearing an end

Trump is set to meet Middle East leaders at the UN and said he hoped an end to the war against Iran was near. A ceasefire framework could reopen the Strait of Hormuz and let Saudi Arabia repair its East-West Pipeline, pulling pump prices down. No talks on Hormuz are scheduled, and Houthi-Saudi fighting is escalating in parallel.

6

Houthi-Saudi front widens into a second oil choke point

Possible Resolves by Oct 31, 2026

Discussed by: Reuters reporters covering the Sept. 17 Houthi-Saudi escalation

Houthi fighters are launching drones and missiles at Saudi cities and tightening their grip on Bab el Mandeb, another critical waterway. Saudi aircraft are pounding Yemen. If the East-West Pipeline stays down and Bab el Mandeb traffic is threatened, Saudi oil exports face two closed routes at once.

Historical Context

3 moments from history that rhyme with this story — and how they unfolded.

October 1973 - March 1974

1973 oil embargo (1973-1974)

Arab members of OPEC cut oil exports to the US and its allies after Washington backed Israel in the Yom Kippur War. Oil prices roughly quadrupled, and Americans waited in long gas lines under odd-even rationing.

Then

Gasoline prices roughly doubled within months; the embargo ended after negotiations in March 1974.

Now

It created the Strategic Petroleum Reserve and made oil shocks a recurring feature of American politics.

Why this matters now

Like the Hormuz closure today, a geopolitical act shut off a key supply route and sent pump prices soaring within weeks.

January - December 2008

2008 oil spike (2008)

Crude hit $147 a barrel in July 2008, and the US average gas price peaked around $4.11 a gallon. On Labor Day weekend 2008, gas was at an inflation-adjusted record near $5.63 in today's dollars.

Then

Prices collapsed within months when the financial crisis crushed demand.

Now

2008 held the Labor Day price record until 2026 and remains the reference point for what high fuel prices look like.

Why this matters now

It shows how fast supply shocks can spike prices, and how quickly they unwind when demand collapses.

February - June 2022

2022 fuel spike after Russia's invasion of Ukraine (2022)

After Russia invaded Ukraine, sanctions and market panic pushed US gas to an average of about $5.02 by June 2022, the highest nominal national average on record.

Then

Prices eased over the following months as the US released crude from the Strategic Petroleum Reserve.

Now

The episode set expectations for how governments respond to fuel shocks, including reserve releases and waiver extensions.

Why this matters now

The 2026 crisis reuses the same playbook, but with a more direct supply choke point: a closed strait rather than sanctions. Gas at $4.44 in September 2026 was still below the $5.02 record.

Sources

(21)