In September 2025, diesel prices in the United States, Brazil, and China moved in opposite directions in response to regional dynamics and global volatility in crude oil markets. In the U.S., prices changed little overall, experienced only minor fluctuations week-over-week and appreciated significantly compared to the same time a year ago, as demand remained firm and consumption was higher than had been expected. The U.S. continued to experience price differentials between regions, with the West Coast remaining the most expensive and the Gulf Coast remaining the most competitive. In Brazil, prices experienced distancing reductions in both regular and S-10 diesel, though a few states saw marginal increases as the overlying trend continued to maintain a general neutral outlook. In China, seasonal factors culminating from the autumn harvest, ending the fishing ban, and continued levels of infrastructure activity had caused some lift in demand, which made up for some instances of weakness due to weather, which may be at an end for this month. Prices for diesel across all regions remained relatively tied to crude oil market fluctuations presented; ongoing geopolitical risk and inability for industry and exporters to balance demand and supply has added uncertainty regarding the rate of mortality in price trends for the future.
