“The average price for diesel no. 2, at $6.29 per gallon, reached a new all-time high in September 2026, up 9.3% from the previous all-time high reached in June 2022, up 15.2% from August 2026, and up 67.8% from September 2025,” BTS said.

Average Price for Regular Motor Gasoline September 2026 Year-Over-Year Increase

• West Coast: $5.54 (up 31.1%)
• Rocky Mountain: $4.44 (up 39.6%)
• Central Atlantic: $4.37 (up 37.4%)
• New England: $4.31 (up 40.0%)
• Midwest: $4.17 (up 38.3%)
• Lower Atlantic: $4.07 (up 39.8%)
• Gulf Coast: $3.86 (up 41.2%)