Gasoline Prices Spiked on Geopolitical Shock—But Refining Margins and Seasonal Blends Are Fueling a Double Whammy at the Pump

The shock to the system arrived last week. The national average price for a gallon of regular gasoline now stands at $3.32, a figure that masks a violent spike. Prices jumped more than 10% in just seven days, marking the steepest weekly increase in years and the highest level since September 2024. This is a classic supply shock scenario, triggered by a single, dramatic event.

The catalyst was the joint U.S./Israel attack on Iran on February 28. The conflict escalated rapidly, effectively blocking the Strait of Hormuz. This narrow waterway is a chokepoint for global oil, and the disruption has stranded tankers carrying an estimated 20 million barrels of oil per day. The immediate market signal is clear: a massive, sudden reduction in the world's available supply. In response, oil prices surged. American crude settled at $90.90 last Friday, a 36% climb in a single week, while Brent crude hit $92.69. The market is pricing in a severe, near-term shortfall.

This is a textbook case of geopolitical risk translating directly to consumer pain. The attack didn't just target Iran; it threatened the flow of oil from the entire region. The resulting volatility has already sent diesel prices up 15% and is accelerating seasonal demand pressures. For now, the price move is a direct reflection of a constrained supply line. The question for the coming weeks is whether this shock will be temporary, as the market digests the disruption, or if it marks the start of a longer, more painful inflationary cycle.

Assessing the Underlying Supply-Demand Balance

The sharp price spike is a direct reaction to a severe supply shock. But the longer-term trajectory depends on the underlying supply-demand balance, which currently points to downward pressure. The U.S. Energy Information Administration's latest forecast sees retail gasoline prices falling 6% in 2026, a clear signal that fundamental market conditions are not supportive of sustained higher prices. This projection follows a multi-year trend of declining gasoline costs since their 2022 peak.

J.P. Morgan's bearish outlook for crude oil reinforces this view. The bank expects Brent crude to average around $60 per barrel in 2026, a level far below the recent spike. Their analysis is rooted in a persistent supply surplus, where global oil supply is set to outpace demand. This forecast assumes that even with geopolitical tensions, protracted disruptions are unlikely, and the market will eventually correct toward a more balanced state.

Yet, this soft fundamental backdrop faces a near-term counter-pressure. Seasonal demand is rising as spring break travel begins, and refineries are transitioning to more expensive summer-blend gasoline. This blend requires pricier additives to meet environmental standards, a cost that gets passed to consumers. As one analyst noted, this seasonal shift is already a "double whammy" with the Iran situation, likely to push prices higher in the coming weeks. The EIA itself noted a recent decline in gasoline supply last week, adding to the tightness.

The bottom line is a tug-of-war. The geopolitical shock has created a temporary, violent squeeze on supply, driving prices up sharply. But the structural forecast points to a weaker market, with ample supply and moderating demand growth. The current rally is a reaction to a specific event, not a new trend. For prices to hold these elevated levels, the supply disruption would need to persist and deepen, overcoming the powerful headwinds from the EIA's price forecast and J.P. Morgan's surplus outlook.

Refining Margins and the Path to the Pump

The supply shock is already reshaping the economics of the refining industry. For refiners, the key profit indicator-the "crack spread"-has jumped dramatically. This spread, which measures the difference between the price of refined products and the cost of crude oil, is a direct reflection of their gross margin. In Asia, Singapore refining margins have surged to the highest level since 2022, with the standard 3-2-1 crack spread hitting nearly $43.50 per barrel. The reason is clear: the war in the Middle East has tightened fuel markets, causing jet fuel, diesel, and gasoline prices to rise faster than crude oil itself. This widening gap is a primary driver of pump prices.

The mechanics are straightforward. The cost of crude oil accounts for roughly 50 to 60 cents of each dollar spent at the pump. When the crack spread compresses, it's the refiner's margin that shrinks. But in this crisis, the spread is expanding, meaning refiners are earning more per barrel. This profit surge is a direct result of the constrained supply of refined fuels, exacerbated by export restrictions from China and refinery cutbacks due to crude shortages. Globally, this dynamic is pushing refinery stocks outperforming oil producers.

Yet, this margin compression between crude cost and product price is the very channel through which the supply shock reaches consumers. As crude prices spike, the higher input cost gets passed through, but the widening crack spread also signals that refiners are capturing more of the value. The net effect is a powerful upward pressure on retail gasoline. The seasonal transition to more expensive summer-blend gasoline adds another layer, creating a "double whammy" with the geopolitical tension.

Regional price differences are also emerging. The West Coast, already the nation's most expensive region, is expected to see prices remain higher for longer. This is due to the upcoming loss of refinery capacity in that region, which will contribute to relatively higher gasoline margins. In contrast, the Gulf Coast is forecast to maintain the lowest prices. This divergence means the national average of $3.32 is a blunt measure; drivers in some areas are likely to see even steeper increases.

The bottom line is that the refining sector is currently benefiting from the crisis, but that benefit is being passed through to consumers. The expanding crack spread is not a buffer against higher pump prices; it is a key part of the mechanism driving them. For now, the path from crude to the pump is clear and upward.

Catalysts and Risks: What to Watch

The path for gasoline prices hinges on a few key developments in the coming weeks. The immediate catalyst is the duration of the supply disruption. The blockade of the Strait of Hormuz has left tankers carrying an estimated 20 million barrels of oil per day stranded. If this remains in place, it will continue to squeeze global supply and keep prices elevated. A critical watchpoint is whether key exporters like Kuwait follow through on their precautionary production cuts. Any formal reduction in output from major producers would deepen the market's tightness and signal a more sustained shock.

On the supply side, U.S. data will provide a real-time check on whether the disruption is translating into tighter domestic inventories. Monitor weekly reports on gasoline supply and refinery utilization rates. A sustained decline in gasoline stocks and lower refinery runs would confirm that the supply shock is reaching American consumers. Conversely, if inventories hold steady or build, it would suggest the market is absorbing the disruption or that domestic production is holding up, which could ease price pressure.

The biggest risk to a sustained price increase is a de-escalation of geopolitical tensions. If the conflict in the Middle East cools, the strait blockade could lift, releasing the stranded oil and flooding the market. This would likely trigger a sharp reversal in crude prices. J.P. Morgan's bearish forecast, which sees Brent averaging around $60 per barrel in 2026, assumes such a correction. The risk is that even if tensions ease, the seasonal demand ramp-up from spring break and the transition to more expensive summer-blend gasoline may not fully offset the earlier supply shock. If crude prices fall back toward $60 while seasonal demand is still building, the market could find a new, lower equilibrium for gasoline.

In short, watch the Strait of Hormuz and production cuts for supply pressure, and U.S. inventories for domestic impact. The key vulnerability is that the geopolitical shock could fade faster than the seasonal demand tailwind builds, leaving the market to re-price around a weaker fundamental outlook.