When diesel prices rise, the impact can extend far beyond the gas station. As diesel powers much of the transportation and agricultural supply chains in the US, higher costs can eventually show up in everyday household expenses. According to AAA, the national average for a gallon of diesel reached a record $5.85 in September 2026, surpassing the previous high of $5.81 in June 2022. Diesel is widely used by trucks, trains and farm equipment, meaning higher fuel costs can make it more expensive to move goods and grow food. Those increased expenses can then work their way into the prices consumers pay at stores. The effects can also reach local budgets. About 90% of the nation’s 500,000 school buses run on diesel, putting additional pressure on school districts as fuel costs rise. Rising diesel prices can also significantly affect farmers. New York farmer Dale Hemminger said his fuel costs had reached nearly $45,000 for a 10,000-gallon tank in 2026, compared with around $25,000 the previous year. Diesel typically costs more in the fall ahead of harvest season, and heating oil often moves with diesel prices as winter approaches.
Railroad fuel surcharges on grain shipments have more than doubled over the past year, rippling through the farm belt and raising transportation costs as many farmers struggle with higher costs.
