Concerns about global fuel supplies are growing after Shell CEO Wael Sawan warned that gasoline and diesel markets are tightening as refineries prioritize jet fuel production in response to disruptions caused by the ongoing conflict involving Iran.
Speaking during an interview with CNBC, Sawan explained that the war dramatically altered refinery operations around the world. As supplies of jet fuel from the Middle East were disrupted, aviation fuel prices surged, creating strong financial incentives for refiners to shift production toward jet fuel.
According to Sawan, Shell increased its jet fuel production by roughly 20 percent to meet soaring demand.
That decision, however, came with an important tradeoff.
Refineries operate with limited capacity, meaning increasing production of one petroleum product generally reduces output of others. In this case, producing more jet fuel meant producing less gasoline and diesel from the same barrels of crude oil.
As aviation fuel markets have gradually stabilized, refiners are now confronting the consequences of that earlier shift.
“The price signals are that we are short on diesel and gasoline,” Sawan said, warning that tighter supplies could eventually translate into higher prices for consumers and businesses alike.
Prepare for Dieselgeddon.
Shell CEO Wael Sawan just warned there's not enough diesel to go around for much longer.
And refineries are being pushed beyond 100% capacity (seriously) by delaying critical maintenance.
This raises the risk of explosions. Those are sometimes fatal,…
— HealthRanger (@HealthRanger) August 3, 2026
Because diesel powers much of the nation’s freight transportation system, agriculture, construction equipment, and manufacturing, prolonged shortages or significant price increases can ripple throughout the broader economy. Higher diesel costs often translate into increased shipping expenses, which can ultimately affect the prices consumers pay for everyday goods.
Some analysts are also expressing concern about refinery operations themselves.
Health Ranger, writing on X, argued that many refineries have delayed scheduled maintenance in an effort to maximize production during the recent supply disruptions. According to that assessment, postponing maintenance could increase operational risks while also creating the possibility that multiple refineries may eventually need to shut down for overdue repairs, temporarily reducing fuel production even further.
While those claims reflect one commentator’s assessment rather than official industry guidance, they underscore growing concerns about how long refiners can continue operating at elevated production levels before maintenance becomes unavoidable.
The uncertainty comes as geopolitical tensions remain elevated.
President Trump has continued discussing possible next steps regarding Iran while maintaining pressure on Tehran through military positioning and diplomatic negotiations. Markets remain highly sensitive to any developments that could affect shipping routes or oil production throughout the Middle East.
Chevron CEO Mike Wirth has also warned about the broader energy picture.
Appearing on “Sunday Morning Futures,” Wirth said expanding security risks now extend beyond the Strait of Hormuz.
“We now see, not only the Strait of Hormuz, but the Red Sea and the Black Sea have risks and uncertainties. So, some of the challenges have expanded, and the risks to supply are very real,” Wirth said.
The Strait of Hormuz remains one of the world’s most important energy chokepoints, with a significant percentage of globally traded crude oil passing through the narrow waterway. Any disruption there can have immediate consequences for international energy markets.
According to Wirth, global oil inventories are also declining while demand remains strong, creating what he described as a fragile and uncertain market.
For consumers, the situation bears close watching. While there has not been a widespread diesel or gasoline shortage across the United States, industry executives are signaling that product markets have tightened considerably. If refinery constraints continue, shipping lanes remain threatened, or geopolitical tensions escalate further, motorists and businesses could eventually feel the effects through higher fuel prices and increased transportation costs.
Whether those concerns develop into a broader supply problem will likely depend on how quickly refinery production returns to a more balanced mix and whether tensions in the Middle East begin to ease in the months ahead.
It has to be refined. We have the product, it’s the refining process. There’s your bottle neck. When you drill baby drill, you must be able to refine baby refine.