Refined products do not all react in the same way to an oil crisis, and diesel is often the most sensitive. To understand why, it is necessary to look at how crude oil is turned into usable fuels and how each of these fuels is used in the economy.
1. Not all fuels are “born” the same in refineries
Crude oil is not directly usable: it is processed in refineries into different products (gasoline, diesel, kerosene, heating oil, etc.). However, these products are not produced in the same proportions or under the same technical constraints.
Diesel requires more specific refining processes, particularly to meet strict environmental standards (sulfur content, particulates, etc.). Not all refineries can easily produce large quantities of it, nor can they quickly increase output in times of crisis. As a result, diesel supply is less flexible than that of some other products.
2. A very strong and stable structural demand
Diesel is not an “optional” fuel. It is at the core of the real economy:
-freight trucks
-freight trains in many countries
-commercial shipping (in certain regions and uses)
-agriculture (tractors, farming machinery)
-industry and construction (heavy equipment)
Unlike gasoline, whose demand can vary slightly with prices (fewer trips, carpooling, etc.), diesel demand is much more rigid. The economy cannot easily reduce its use without immediately slowing production and distribution.
3. A supply chain more sensitive to disruptions
Diesel is not just a consumer fuel: it is the fuel that keeps the entire logistics chain moving.
This creates a cascading effect:
-less diesel → more expensive transport
-more expensive transport → higher prices for almost all goods
-general cost increase → inflation
This is why a disruption in crude oil supply has a stronger impact on diesel: it acts as a multiplier in the economy.
4. Fewer buffers in the system
Crude oil markets can sometimes absorb shocks thanks to strategic reserves or alternative producers. But for diesel, the room for adjustment is more limited:
-lower stock levels in some countries
-reliance on refining infrastructure already close to maximum capacity
-difficulty in rapidly increasing production
So when crude oil becomes scarce or more expensive, diesel has little flexibility to cushion the shock.
5. Why the impact is stronger downstream than upstream
The mechanism can be summarized as follows:
-Upstream (crude oil): global, relatively liquid market, multiple potential sources
-Downstream (diesel): more constrained production + essential demand + central role in logistics
Therefore, a shock in crude oil turns into amplified tension in diesel markets because it combines:
-difficult-to-adjust production
-indispensable demand
-a systemic role across the entire economy
This is why, in a crisis like the Strait of Hormuz disruption, diesel often becomes an even more critical indicator than crude oil itself: it directly reflects the world’s physical ability to keep functioning (transport, production, distribution).
To overcome such a crisis in road transport, the responses first rely on reducing dependence on oil, which is particularly sensitive to international shocks that directly affect gasoline and diesel prices. In the short term, strengthening strategic fuel reserves helps temporarily cushion supply disruptions, while price stabilization mechanisms help limit sudden increases at the pump. In the medium and long term, the sector’s transformation involves a structural reduction in fossil fuel consumption: accelerating the electrification of light vehicles and trucks (gradually replacing internal combustion engines with battery-powered electric motors), developing charging infrastructure, improving public transport, and optimizing freight through more efficient logistics that reduce unnecessary trips. Shifting part of freight transport to rail, which is less energy-intensive than road transport, also helps reduce pressure on diesel.
Also, kerosene is not directly extracted: it is produced in refineries from crude oil. Therefore, when crude oil becomes scarcer or more difficult to transport, refineries receive less feedstock and must reduce their output of fuels, including kerosene. At the same time, global kerosene inventories---which normally act as a “buffer” to absorb shocks---are quickly depleted, because aviation demand remains strong, especially ahead of the summer season. On a global scale, this increase is directly passed on to airlines, for which fuel represents a major share of costs, pushing them to raise ticket prices or reduce flights. In air transport, room for maneuver remains more limited due to the lack of a direct alternative to kerosene. In the short term, cost management relies on building inventories when prices are lower and using financial hedging strategies to smooth market fluctuations, as well as optimizing routes and aircraft fuel efficiency. In the medium term, diversifying sources of jet fuel supply helps reduce vulnerability to disruptions linked to oil corridors. In the longer term, the transition to sustainable aviation fuels derived from biomass or waste, as well as the development of hybrid or electric technologies for short-haul flights, opens a path toward gradually reducing dependence on oil.
SUMMARY:
Diesel Is Everyone’s Lifeblood
When I see a truck, it runs on diesel.
When I see a tractor, it runs on diesel.
When I see a boat, a bus, a construction machine, a delivery vehicle, a heavy taxi: all of that runs on diesel.
Gasoline is mainly for small passenger cars.
Jet fuel is for airplanes, which are far away, flying high.
But diesel powers everything that moves food, businesses, people, and goods. If diesel is in short supply, everything stops. Grocery stores can no longer receive deliveries. Construction sites stop operating. Deliveries no longer arrive.
From one barrel of oil, roughly 50% gasoline and 50% diesel are produced. This is not a choice people make. It is the nature of crude oil.
When oil becomes scarce, you cannot simply say: “Make more diesel and less gasoline.”
Refineries cannot do that immediately.
That is what makes diesel vulnerable: when there is less oil, there is less diesel, and it cannot be produced faster.
A large share of diesel comes from the Middle East, where there are wars, tensions, and embargoes.
When there is a problem there, diesel feels the impact immediately.
Gasoline can come from elsewhere. There is American crude oil, which is lighter and yields more gasoline.
Jet fuel is also dependent on oil supply, but it serves fewer people than diesel does.
When diesel prices rise by 80%, it is because the Middle East is at war.
And diesel shouts louder because everyone needs it, not just people driving personal cars.
If gasoline becomes too expensive, you can buy an electric car. You can take the bus. You can walk.
If jet fuel becomes too expensive, flying is distant enough that you can wait.
But diesel?
You cannot tell a truck: “Switch to a battery.”
You cannot tell a tractor: “Switch to electricity.”
You cannot tell a delivery driver: “You’re going to walk.”
Diesel has no quick alternative.
That is why, when oil goes through a crisis, diesel shouts louder. It has no easy way out.
When I see prices rising, I understand:
-Diesel is more expensive → trucks pay more → goods become more expensive.
-Diesel is more expensive → deliveries are slower → grocery stores have less stock.
- Diesel is more expensive → construction projects slow down → people work less.
Gasoline mainly affects personal vehicles.
Jet fuel affects airplanes.
But diesel affects everything.
That is why, when it rises, everything rises. And that is why people feel it sooner.
→ Diesel shouts louder than gasoline during crises because:
-Everyone needs it (trucks, tractors, buses, boats, machines).
-It cannot be produced faster (refineries cannot quickly change the diesel/gasoline ratio).
-It comes from regions affected by conflicts (Middle East, tensions, wars).
-It has no quick alternative (you cannot replace a truck with a battery overnight).
-It keeps the economy running (if it rises, everything rises).
Gasoline affects cars.
Jet fuel affects airplanes.
Diesel affects everything else.