What do Diesel and Gasoline Tell us About Oil Prices?
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Uncertain Outlook for Transport Fuels?

The futures market hints at continued weakness in refined product demand" (or sustained end to the platinum era for refiners). While oil prices have fallen sharply since July 2024, they have been outpaced by declines in diesel prices, with the prompt crack spread falling by around $7-8 per barrel to levels not seen since 2021. CME Group data shows that the market structure for diesel cracks is in contango, where prompt prices trade at a discount to the deferred contract months. The recovery in prices reflected in the June and December 2025 values still puts diesel cracks at multi-year lows. The U.S. gasoline market is also showing similar trends in price direction, highlighting the end of the platinum era for refiners.  

These changes could have an impact on the likely direction for oil prices with the weakness in refined products markets extending beyond the nearby contract months.

Crack Spread transport fuel

Naphtha A Sign of Strength for Refiners

Despite the weakness in road transport fuels, there are other bright spots for refiners. Strong petrochemical demand has been supportive to the price of naphtha, with refiners searching for crude oils with higher yields for the light-end products. The chart below shows how the price of naphtha has performed compared to crude oil and other fuels such as diesel, gasoline and fuel oil. The rebound in petrochemical demand, due to improving margins, has seen naphtha outstrip gains in the other products. 

However, it should be considered that the naphtha yield in a barrel of crude oil is a relatively small portion of the overall barrel. Using the global average, a typical refinery produces around 8% of naphtha per barrel of oil therefore the overall impact on refinery margins is more limited.  

Naphtha remains a positive sign for refiners on strong petchem demand
Source: Bloomberg

The demand outlook for petroleum products remains challenging amidst a general weakness in the global economy. Strong competing forces from other sectors such as electric vehicles and the drive towards less fossil-fuel-intensive products such as biofuels have also hindered the continued growth in demand year on year. 

As product demand remains sluggish, the oil markets will continue to watch trading activity in diesel and gasoline prices over the coming months as a likely indicator for future price direction and whether there will be a new platinum era on the horizon. 

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