Refinery crack spreads, an approximate measure of the profitability of refining a barrel of crude oil into refined products such as gasoline and diesel, have soared in recent weeks to reach their highest levels since early 2024. As discussed in RBN’s TradeView report, the diesel and 3-2-1 crack spreads late last week reached their highest point since mid-February 2024 in the case of the diesel crack (orange line and arrow for comparison in chart below) and since late March 2024 in the case of the 3-2-1 crack (green line and arrow). In contrast, the gasoline crack reached its highest level since mid-September 2025 (blue line and arrow).

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