Diesel at a Record $6.53 Is a Household Number Too
The national average price of on-highway diesel hit $6.5276 a gallon on September 22, 2026, the highest number ever recorded in AAA's national average series, and it landed with almost no attention outside the trucking press. A month when regular gasoline grabbed the headlines at $4.48 a gallon is the highest September reading since 2022 , a number drivers see every day. Diesel is different. It is the fuel inside the price of the food in the cart, the boxes on the porch and the rates on every long-haul route, and a year ago it cost $3.6856. That is a 76 percent increase, and unlike gasoline it has never had a season when it reliably falls.
Key Takeaways Diesel peaked at $6.5276 a gallon on Se…
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