How a Litre of Diesel Reaches Your Pump

India consumes roughly 93 million tonnes of diesel and 42 million tonnes of petrol a year, across something in the order of ninety thousand retail outlets, in a country where a great many of those outlets are a long way from anything. Almost none of them run dry.

That reliability is so complete that it has become invisible, and its invisibility is precisely why fuel feels like a fixed feature of the world rather than a logistics achievement with specific vulnerabilities. This is a walk through the chain, one handover at a time.

India imports around 88 per cent of the crude oil it refines, and crude import dependence has been rising rather than falling — 88.2 per cent in FY2024–25 and about 88.6 per cent in FY2025–26. In volume that is roughly 4.8 to 5 million barrels a day.

The sourcing mix has become the interesting part. Iraq, Saudi Arabia and the UAE remain long-standing term suppliers, and Russian crude — which entered the mix at scale in 2022 — has stayed there, accounting for something like a third of imports across the 2024 to 2026 period and spiking to record levels in mid-2026.

One geographic fact matters more than the rest. Close to half of India’s crude imports transit the Strait of Hormuz. That is a single waterway, about 33 kilometres wide at its narrowest, carrying half the feedstock of a country of 1.4 billion people.

Crude moves in very large crude carriers holding around two million barrels. A cargo from the Gulf reaches an Indian west-coast port in a few days; a cargo from West Africa or Latin America takes weeks.

This is where the lag comes from that confuses everyone about fuel prices. The crude being refined into the diesel you buy today was purchased weeks ago, at a price agreed then. When you read that the international crude price has fallen and wonder why the pump has not moved, part of the answer is that the barrel at the pump was bought before the fall.

India runs 23 refineries with a combined capacity of about 258 million tonnes a year, the fourth largest refining sector in the world, with plans to reach roughly 310 million tonnes by 2028. Jamnagar in Gujarat is the largest refining complex anywhere on earth.

Capacity comfortably exceeds domestic consumption, which is why India is a net exporter of refined products while importing nearly all its crude. The country’s position in the oil trade is essentially that of a processor: buy crude, add value, sell products.

Inside the refinery, the crude is separated by boiling point and then reprocessed. The key point for supply is that the proportions are only partly adjustable. A barrel yields a certain slate of products, and while cracking units can convert heavier fractions into lighter ones, no refinery can produce only what the market happens to want that month. This is why petrol and diesel prices sometimes move in opposite directions: they are joint products of the same process.

From the refinery, product moves through multi-product pipelines to storage terminals and depots spread across the country, supplemented by rail rakes and coastal shipping. A single pipeline carries different products in sequence, separated only by the interface between batches, which is itself managed and reprocessed.

The depot is where the product becomes a specific company’s fuel. The base product is largely interchangeable; the branded additive package is dosed in at this stage. It is also where marker dyes go into subsidised or restricted products, which is the basis of most adulteration detection.

The final leg is a road tanker to the retail outlet. It is the least automated, most human-dependent step in the chain and, unsurprisingly, where most of the losses and most of the adulteration occur. Modern tankers use GPS tracking and electronic locks on the discharge valves for exactly this reason.

At the outlet, the fuel goes into underground tanks and is drawn up by the dispensers. The retail price is set daily under the dynamic pricing regime introduced in 2017, and the three public sector oil marketing companies — IOCL, BPCL and HPCL — own around 90 per cent of India’s outlets.

• •It is long, and length is lag. Weeks separate the purchase of a barrel from the sale of a litre. No amount of daily price revision removes that.
• •It is denominated in dollars. Crude is bought in dollars and sold in rupees. A rupee that weakens raises the cost of every litre regardless of what happened to the oil price, and that channel is often larger than the commodity move itself.
• •It has one geographic knot. Half of it goes through the Strait of Hormuz, and no supplier diversification fixes that.
• •It is joint-product constrained. You cannot refine more diesel without producing more of everything else, so a shortage in one product cannot be solved quickly by making more of it.
• •Its last mile is a person. Almost every quality problem an ordinary buyer encounters happens between the depot and the dispenser.

An electricity supply chain has a different shape. Its fuel is often domestic — coal, hydro, sun, wind — and the last mile is a wire that does not require a truck to make a delivery. Its weaknesses are real and different: generation adequacy, transmission congestion, distribution reliability. We have written on how power actually moves across that network.

The point of understanding the fuel chain is not that it is fragile. It is remarkably robust, and it took a century to make it so. The point is that its costs and risks are structural — import dependence, currency exposure, a chokepoint, a six-week lag — rather than the result of anyone doing a bad job. Those are the things that do not get better with effort, and they are the reason the arithmetic of an electric three-wheeler keeps working out the way it does.