Related: Bob Adamsky on Fuel Volatility: "Don't Panic, Have a Plan."
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Fuel Prices Surge in September | September Fuel Update
September brought major fuel price swings, including diesel crossing $6 a gallon. Here’s how gas and diesel prices changed throughout the month, and where they stood heading into October.
September 30, 2026
- September experienced significant fluctuations in fuel prices, impacting both gas and diesel.
- Diesel prices surged past $6 per gallon during the month, highlighting a notable increase.
- The increases in fuel prices have implications for consumers as they move into October.
*Summarized by AI
Fuel prices climbed sharply throughout September, creating another month of significant cost pressure for fleets. According to the U.S. Energy Information Administration, the national average for regular gasoline rose from $4.071 per gallon on Aug. 31 to $4.157 on Sept. 7, $4.319 on Sept. 14 and $4.478 by Sept. 21. Diesel saw an even steeper increase, climbing from $5.599 per gallon at the end of August to $5.967 on Sept. 7, $6.285 on Sept. 14 and $6.529 by Sept. 21. The increases came amid rising crude oil prices and considerable regional volatility, leaving fleets facing substantially higher fuel costs as September came to a close.