The ratio of NGL prices to crude oil weakened to 0.42 on Friday (green oval, right graph), a level breached only twice this year. The decline was mostly due to falling butane and propane prices, off 8% and 5% respectfully since early May. This NGL-to-crude metric is the average price of a basket of Mont Belvieu NGLs divided by the price of Cushing NYMEX domestic sweet (WTI) crude and indicates the relative value of a typical NGL stream versus oil.  

The ratio so far during 2025 has averaged 0.44 or 44% of crude oil, which is close to the long-term annual level. As shown in the left graph below, the annual NGL-to-crude ratio since 2013, has averaged 0.426, ranging between 0.36 and 0.52 (red line).

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