Gas price relief on the way as Arizona switches to winter blend of gasoline

PHOENIX – While gas prices have soared in Arizona during the month of September, cheaper prices are on the way.

In the past month, fuel prices have climbed 24 cents per gallon on average in Arizona, but as refineries switch to a winter a blend from the summer blend with higher production costs, Arizonans will soon see cheaper prices at the pump.

The EPA requires gas retailers in Maricopa County and portions of Pinal and Yavapai Counties to sell these summer blends from June 1 through Sept. 30. The switch is made in order to reduce pollutants.

In Arizona, the average price for a gallon of regular gasoline is at $3.57 as of Thursday. The price dropped two cents since last week, according to AAA’s Fuel Prices database. In Phoenix, the price is significantly above the statewide average at $3.85 per gallon.

Arizona ranks as the state with the seventh-most expensive gas in the nation. The national average for a gallon of regular gasoline fell to $3.15, a five-cent drop since last week.

Gas prices are beginning to rise again, but there’s a seasonal shift on the horizon: winter blend fuel is coming soon. As Bruce St. James puts it, it’s “the pumpkin spice of gasoline.” 🚗 @OutspokenKTAR pic.twitter.com/2jHA6fdQ82

— KTAR News 92.3 (@KTAR923) September 17, 2025

What determines the price of gas?

The price of gas is largely determined by the price of crude oil. West Texas Intermediate (WTI) is currently trading at $65.31 a barrel. The price of crude oil has remained relatively consistent during the month of September.

Which states have the most expensive gas?

The states with the most-expensive gasoline in the nation are as follows:

1. California ($4.64)
2. Washington ($4.57)
3. Hawaii ($4.48)
4. Oregon ($4.21)
5. Nevada ($3.90),
6. Alaska ($3.88)
7. Arizona ($3.57)
8. Idaho ($3.50)
9. Utah ($3.39),
10. Illinois ($3.37).

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