US gasoline prices rise to $3.79 per gallon as Iran war fuels energy inflation

The national average price for regular unleaded gasoline in the United States reached $3.79 per gallon this week, the highest reading since October 2023, according to data from the Energy Information Administration. The increase is a direct result of crude oil trading roughly 40% above its pre-war level, as the Iran conflict and the effective closure of the Strait of Hormuz continue to squeeze global supply. For American households, this is no longer an abstraction. A driver filling a 15-gallon tank is paying about $9 more per fill-up than they were before the crisis began.

The speed of the price increase has been striking. National average gasoline prices were around $3.15 per gallon in late January 2026. The climb to $3.79 over roughly eight weeks is the fastest sustained rise since the summer of 2022, when prices briefly exceeded $5 per gallon nationally following Russia's invasion of Ukraine and the subsequent European energy crisis. That episode eventually resolved as supply chains adjusted and demand softened. The Hormuz closure presents a structurally different problem because the physical chokepoint, not just market sentiment, is what is driving prices.

Why crude prices staying 40% above pre-war levels matters so much

Brent crude was trading around $74 per barrel in the weeks before the Iran conflict escalated. At current levels near $103, the price increase is approximately 39%. That 40% premium does not stay contained to the gas station. Diesel, which powers freight trucks, cargo ships, farm equipment, and construction machinery, has risen by a similar proportion. When diesel gets more expensive, delivery costs go up, and those costs work their way into the price of groceries, manufactured goods, and construction materials over the following weeks.

The Federal Reserve's preferred inflation measure, the PCE price index, was running at 2.5% year-over-year in January 2026. Goldman Sachs has since revised its 2026 inflation forecast up to 2.9%, and in a $110 per barrel scenario, up to 3.3%. Each of those numbers makes the Fed's job harder. Rate cuts that were being priced into futures markets as recently as February are now in serious doubt, and some analysts are openly discussing the possibility of a rate increase if energy-driven inflation begins feeding into services and wages.

JPMorgan's warning about the limits of policy tools

JPMorgan Chase analysts published a note this week arguing that measures like the IEA's 400 million barrel emergency reserve release will have limited and temporary impact unless commercial vessel transit through the Strait of Hormuz is physically restored. Their reasoning is straightforward: reserves replace barrels, they do not repair shipping routes. Once the released barrels are absorbed by the market, which the IEA itself estimates covers roughly 20 days of normal Hormuz traffic, the underlying supply deficit reasserts itself unless something changes on the ground.

JPMorgan's commodity team has modeled three scenarios. In the first, the strait reopens within 30 days, Brent retreats to around $88 per barrel, and gasoline prices begin declining by early May. In the second, the closure extends through Q2 2026, Brent stabilizes around $110, and national average gasoline prices reach $4.20 per gallon. In the third, the conflict intensifies and Brent reaches $130 or higher, at which point gasoline prices could approach or exceed the $5 threshold seen briefly in 2022. The bank did not assign specific probabilities to each scenario.

Regional variation in gasoline prices across the US

The $3.79 national average conceals significant regional differences. California, which has its own fuel blend requirements and higher state taxes, is already averaging $4.81 per gallon. Washington state is at $4.43. By contrast, states in the Gulf Coast region like Texas and Louisiana, which benefit from proximity to refining capacity, are averaging closer to $3.35. Midwest states that rely heavily on diesel for agricultural operations are seeing farm fuel costs rise faster than pump prices suggest, because agricultural diesel is priced differently and its cost increases are harder for farmers to pass on quickly.

The political sensitivity of gasoline prices is well established. A University of Michigan consumer sentiment survey from February 2026, conducted before the sharpest price increases took hold, already showed a 7-point drop in consumer confidence compared to December 2025. Gasoline is one of the few prices that Americans see and process daily, which makes it a disproportionately visible indicator of economic conditions regardless of what broader inflation data shows.

What the Fed can and cannot do

The Federal Reserve has no tool to reopen a shipping strait or lower crude oil prices directly. What it can do is raise interest rates to slow domestic demand, which reduces consumption and eventually puts downward pressure on prices across the economy. The problem is that this tool works slowly and carries significant side effects. Higher rates increase mortgage costs, raise business borrowing expenses, and slow hiring. Using monetary policy to fight an energy price shock that originates outside the US economy means inflicting domestic economic pain to address an imported inflation problem.

Fed Chair Jerome Powell addressed this tension at a conference in February, before the current price surge, noting that the Fed would need to distinguish between a temporary energy price spike and a broader inflation re-acceleration before adjusting policy. The March 26 FOMC press conference will be the first opportunity for Powell to address the current situation directly. Markets are currently pricing a 68% probability that the Fed holds rates unchanged at that meeting, down from 84% two weeks ago, according to CME FedWatch data.