Crack spreads and why they matter The most important point is that a crack spread measures the difference between the market price of a refined petroleum product and the price of crude oil, expressed in dollars per barrel. It is a measure of the market's incentive to turn crude into a particular product. It is not the refinery's actual net profit, because it excludes many operating, transportation and other costs. For example, a diesel crack of $100/bbl means that diesel is trading at a premium o

Crack spreads and why they matter

The most important point is that a crack spread measures the difference between the market price of a refined petroleum product and the price of crude oil, expressed in dollars per barrel. It is a measure of the market's incentive to turn crude into a particular product. It is not the refinery's actual net profit, because it excludes many operating, transportation and other costs. For example, a diesel crack of $100/bbl means that diesel is trading at a premium of $100 per barrel over the chosen crude benchmark. That is an extremely large price differential and can indicate unusually strong demand for diesel, constrained diesel supplies, or both.

The significance of the readings becomes clearer when we examine each benchmark individually.

1. US diesel cracks — the most concerning readings

New York Harbor diesel–WTI

$102.93 per barrel · 3 November

US Gulf Coast diesel–WTI

$90.41 per barrel · 3 November

These two readings measure the premium of diesel over West Texas Intermediate crude in two different US markets.

New York Harbor ($102.93): This represents the Northeast US wholesale fuel market, which is particularly sensitive to heating demand, regional inventories, imports and distribution constraints. A premium above $100/bbl is an exceptionally strong signal that diesel is highly valued relative to crude. It also implies that refiners and importers have a powerful economic incentive to supply the region.

US Gulf Coast ($90.41): This is particularly important because the Gulf Coast is America's principal refining and petroleum-exporting region. A diesel crack this high indicates that the premium is not confined to the Northeast. It suggests substantial value in diesel production even in a region with extensive refining capacity.

The $12.52/bbl difference between these two readings also indicates that diesel is more expensive relative to WTI in New York Harbor than on the Gulf Coast. However, this differential alone cannot establish a physical shortage in either region; transport costs, product specifications and local pricing conditions also matter. These readings become especially significant alongside the reported decline in US distillate inventories to approximately 99.3 million barrels. High diesel premiums combined with depleted inventories are a stronger warning signal than high premiums alone.

2. US Gulf Coast jet fuel crack — $76.68/bbl

This measures the premium of aviation kerosene over WTI crude.

The Gulf Coast is a major supplier of aviation fuel, both domestically and internationally. At $76.68/bbl, the jet fuel crack is extraordinarily elevated, exceeding 99% of observations in the historical series examined by the data provider. Its significance extends beyond aviation. Jet fuel and diesel belong to the middle-distillate family of petroleum products. They compete for portions of refinery output, although refineries cannot freely switch all production between them. A very high jet fuel crack alongside very high diesel cracks suggests that the pressure is affecting middle distillates more broadly, rather than diesel alone.

Economic implications: Airlines face increased fuel costs, potentially affecting fares and profitability. Refiners have an incentive to maximise middle-distillate yields where technically feasible, but refinery configuration and product specifications limit their flexibility.

3. US Gulf Coast gasoline crack — $22.29/bbl

This is the premium of Gulf Coast wholesale gasoline over WTI crude. Unlike diesel, the gasoline crack is considerably lower. It is nevertheless above most historical readings, according to the same EIA-derived series. This divergence is important. Gasoline and diesel are both produced from crude oil, but their supply-and-demand balances differ considerably. The much higher diesel premium suggests that the market places a substantially greater value on additional diesel supply than on additional gasoline supply.

That matters for the broader economy because diesel powers heavy road freight, agricultural equipment, construction machinery, rail transport and substantial parts of industrial activity. Consequently, persistently high diesel cracks can contribute to inflationary pressures even when gasoline margins are relatively subdued.

4. US New York Harbor gasoline crack — $14.94/bbl

This measures the premium of wholesale gasoline in New York Harbor over WTI crude. At $14.94/bbl, the gasoline crack is far below the corresponding New York Harbor diesel crack of $102.93/bbl, namely a difference of almost $88 per barrel. This is particularly revealing because both products are being compared with the same crude benchmark and the same regional market. It indicates that the extraordinary price pressure is concentrated in diesel rather than being evenly distributed across refined products. It also helps explain why headline crude prices or retail gasoline prices can give a misleading impression of the wider petroleum market.

5. US 3-2-1 composite crack — $47.94/bbl

The previously quoted $47.94/bbl is a delayed futures-based reading for 6 November. A separately calculated New York Harbor spot-based 3-2-1 crack was $44.27/bbl on 3 November. The 3-2-1 spread is a simplified measure of gross refining economics. It assumes a refinery processes three barrels of crude oil and produces two barrels of gasoline and one barrel of distillate fuel. A $47.94/bbl composite crack indicates that the theoretical basket of refined products has a gross market value approximately $47.94 per barrel higher than its crude input cost. That is a strong refining incentive, but not a $47.94 net profit per barrel. Refiners must still pay for energy, labour, maintenance, hydrogen, transport and other expenses.

6. European gasoil–Brent crack — $83.63/bbl

This compares the price of European gasoil, a diesel-related middle distillate, with Brent crude. Its significance is particularly relevant to European industrial and transport activity. Europe depends on imported refined products to help balance regional diesel supply and demand. A very high gasoil crack can indicate that European buyers are paying a substantial premium to secure finished distillates relative to crude. However, the level alone cannot establish how much of the premium is caused by Russian export disruption, refinery constraints, freight costs or changes in demand.

Overall significance for the oil market

The central message is that the market is not experiencing uniform pressure across all petroleum products.

The most consequential feature is the combination of very high diesel cracks, unusually strong jet fuel premiums and depleted US distillate inventories. This raises the possibility that the principal constraint in the petroleum system is not simply the availability of crude oil, but the ability to produce and deliver enough of the refined products that industrial economies require.