Arizona vs Washington gas prices
Regular gas is $0.68 a gallon cheaper in Arizona — $10.23 on a 15-gallon fill-up.
Arizona| Grade | AZ | WA | Diff. | |
|---|---|---|---|---|
| Regular | $4.44 | $5.13 | $0.68AZ | Arizona |
| Midgrade | $4.82 | $5.40 | $0.58AZ | Arizona |
| Premium | $5.14 | $5.67 | $0.53AZ | Arizona |
| Diesel | $5.60 | $6.18 | $0.58AZ | Arizona |
Where the $0.68 gap actually comes from
50% of it is tax. Washington charges $0.34 more per gallon in federal and state taxes than Arizona. The remaining $0.34 is a real difference in what the fuel, refining and distribution cost — refinery proximity, pipeline access and state fuel-blend rules.
Fuel, refining, distribution and marginFederal and state taxes Pre-tax figures are estimates — see the note below.
What the gap is worth
Based on today’s $0.68 per-gallon difference, which moves week to week. Use the fuel cost calculator for your own mileage and vehicle.
Prices by metro area
State averages hide a lot. These are the cheapest metros AAA reports on each side.
Other comparisons
Frequently asked questions
Is gas cheaper in Arizona or Washington?
Regular gas is cheaper in Arizona, at $4.44 a gallon against $5.13 in Washington — a gap of $0.68, or 15.3%. On a 15-gallon fill-up that is $10.23. Figures are AAA daily state averages for 2026-08-02.
Why is gas more expensive in Washington?
50% of the $0.68 gap is tax rather than the cost of the fuel. Washington levies $0.34 more per gallon in federal and state taxes; the remaining $0.34 is a genuine difference in what the fuel, refining and distribution cost.
Is diesel cheaper in Arizona or Washington?
Diesel is cheaper in Arizona at $5.60 a gallon, against $6.18 in Washington — $0.58 a gallon apart.