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In December 2025, the average price for regular motor gasoline was $2.89 per gallon; down 5.1% from November 2025 and down 4.1% from December 2024. By region: West Coast: $3.87 (+1.7%) Central Atlantic: $3.01 (-2.7%) New England: $2.92 (-2.3%) Lower Atlantic: $2.74 (-5.5%) Midwest: $2.67 (-7.3%) Rocky Mountain: $2.58 (-9.0%) Gulf Coast: $2.47 (-4.9%). The average price for diesel no. 2 was $3.62 in December 2025, down 5.4% from November 2025, and up 3.5% from December 2024.