The national average price of gasoline dropped below $4.00 per gallon on Thursday for the first time since March, landing at $3.999 after four straight weeks of declining pump prices. The milestone, tracked by AAA, follows the signing of a U.S.-Iran memorandum of understanding that reopened the Strait of Hormuz and sent crude oil prices sharply lower.
For American drivers who spent months watching the numbers climb at their local gas station, the relief is measurable, and it didn't come from a subsidy, a price cap, or a government check. It came from a deal.
The price decline represents a 52-cent drop per gallon over the past month alone. On May 21, the national average stood at $4.56. Brent crude, which traded near $112 per barrel during the third week of May, fell to roughly $78.45 by Thursday morning. West Texas Intermediate dropped from $108 to $75.29 over the same stretch.
Diesel prices followed the same trajectory. The national average for diesel stood at approximately $5.13 per gallon Thursday, down from $5.63 a month earlier, a meaningful cut for truckers and freight operators whose fuel costs ripple through the price of everything Americans buy.
The catalyst is no mystery. President Trump signed a preliminary 60-day ceasefire deal with Iran, a memorandum of understanding that ended the military conflict and reopened the Strait of Hormuz, the narrow waterway through which roughly a fifth of the world's oil supply passes. The Washington Examiner reported that the signing of the peace deal and the reopening of the strait "should lead to gas prices dropping even further."
A formal signing ceremony is set for Friday. The 14-point peace plan includes sanctions relief for Iran, a commitment by Tehran to refrain from developing nuclear weapons, and a ceasefire on all fronts, Just the News reported.
The price context matters. Before the United States and Israel launched joint strikes against Iran on February 28, the national average for a gallon of regular gasoline was $2.98. The conflict sent prices soaring past $4.50, and Trump moved to suspend the federal gas tax as the squeeze tightened on household budgets.
At the time, Trump told Americans the higher prices would last "for a little while" as he sought to prevent Iran from obtaining a nuclear weapon. Critics dismissed the assurance. The prices kept climbing.
Now the numbers tell a different story. The national average has fallen for four consecutive weeks, and the trajectory points lower. Trump took to Truth Social to address his detractors directly, as the Washington Times reported:
"These fools, who think I haven't been tough enough on Iran, when the Stock Market Just Hit A RECORD HIGH, and Oil prices are 'tumbling' down, are either jealous, bad people, or stupid."
The language is Trump's own. The underlying point, that the diplomatic resolution is producing tangible economic results, is harder to argue with when crude has shed more than 30 percent of its value in under a month.
The pattern is familiar. Whether it is political forecasts about primary outcomes or economic predictions dismissed as bluster, the administration's stated expectations have a way of materializing in the data.
The national average masks wide variation. California drivers still face the highest prices in the country at $5.64 per gallon, a figure shaped by the state's heavy regulatory burden, its unique fuel blend requirements, and its layers of environmental taxes. Indiana, by contrast, sits at just under $3.40.
That $2.24 gap between the most and least expensive states tells its own story about policy choices. Californians pay more not because of global oil markets alone but because Sacramento has stacked cost after cost onto every gallon. The Iran deal helps everyone; state-level policy determines how much of that help reaches the consumer.
Trump has not been shy about calling out California's governance, and the gas price disparity offers a clean illustration of why.
The speed of the crude oil decline is striking. Brent crude lost roughly $34 per barrel, about 30 percent, between mid-May and Thursday. WTI dropped $33 per barrel over the same window. Markets moved fast once the Strait of Hormuz reopened and the threat of further disruption receded.
Diesel's decline matters beyond the pump. Trucking companies, farmers, and manufacturers all price their goods partly on diesel costs. A 50-cent drop in diesel over one month feeds through supply chains within weeks, easing pressure on grocery bills, shipping rates, and construction costs.
The National Review has previously reported on similar dynamics when gas prices fell below $4 in August 2022, noting that weakened consumer demand and economic uncertainty contributed to that earlier decline. This time, the driver is different, not a pullback in demand, but a geopolitical resolution that unlocked supply.
That distinction matters. A price drop caused by consumers too squeezed to drive is a warning sign. A price drop caused by restored oil flows and calmed markets is a tailwind.
Just the News noted that the development "is good news for President Donald Trump, whose approval ratings have fallen substantially amid the Iran war and the ensuing economic tumult." The observation is straightforward: voters feel gas prices every time they fill up, and the direction of those prices shapes how they judge the person in charge.
The Iran conflict imposed real costs on American households. Prices jumped more than $1.50 per gallon between late February and late May. The administration's argument, that confronting Iran's nuclear ambitions was worth a temporary price spike, required the "temporary" part to prove true.
Four weeks of falling prices and a signed memorandum of understanding suggest it has. Whether the ceasefire holds, whether Iran honors its commitment on nuclear development, and whether crude continues its descent remain open questions. But the immediate economic signal is unmistakable.
Trump has shown a willingness to confront political setbacks publicly and press forward. On energy prices, the confrontation appears to be paying off.
Gas below $4 is not the finish line. Before the Iran conflict, Americans were paying $2.98. The gap between here and there measures how much further the recovery has to go. But the direction is right, the deal is signed, and the market is responding.
Washington's foreign policy establishment spent months insisting the president's approach to Iran was reckless. The price at the pump, the one number every American checks without reading a briefing paper, is now making the counterargument for him.
