Gas Pain, Week of September 15, 2025

The U.S. average for regular gasoline slipped 2¢ to $3.17 a gallon for the week of September 15, 2025. Over the past 12 weeks it had finished exactly where it started.

Washington was the most expensive state at $4.54, $1.37 above the national figure, with California at $4.47 and Alaska at $4.06 (West Coast excl. California regional average) next. At the other end Texas was cheapest at $2.77, $0.40 below national, followed by New Mexico at $2.77 (Gulf Coast regional average) and Mississippi at $2.77 (Gulf Coast regional average). The gap between the priciest and cheapest state was $1.76 a gallon, which on a 15-gallon tank was $26.47 for the same fill. The ranking counts all 50 states, with the regional average standing in wherever EIA publishes no state figure.

Washington climbed the most, up $0.17 to $4.54; Alaska (+$0.12) and Arizona (+$0.12) also rose. Ohio fell the most, down $0.15 to $2.84; Minnesota (−$0.14) and Colorado (−$0.12) also fell.

At the national average a 15-gallon tank cost $47.52 to fill from empty and a 26-gallon truck tank $82.37; think mid-size sedan and full-size pickup. That was $0.36 less than the week before on the smaller tank and $0.62 on the larger one. Of the ten states at the extremes, 7 were shown at a regional average, because EIA publishes a weekly state figure for only 9 states and the rest take the average of their PADD region. Every figure here was from EIA's weekly retail gasoline series for that week.