Arizona vs California gas prices
Regular gas is $1.21 a gallon cheaper in Arizona — $18.18 on a 15-gallon fill-up. The two share a border, so that gap is worth knowing before you cross it.
Arizona| Grade | AZ | CA | Diff. | |
|---|---|---|---|---|
| Regular | $4.44 | $5.66 | $1.21AZ | Arizona |
| Midgrade | $4.82 | $5.89 | $1.07AZ | Arizona |
| Premium | $5.14 | $6.08 | $0.94AZ | Arizona |
| Diesel | $5.60 | $6.93 | $1.33AZ | Arizona |
Where the $1.21 gap actually comes from
59% of it is tax. California charges $0.71 more per gallon in federal and state taxes than Arizona. The remaining $0.50 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 $1.21 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 California?
Regular gas is cheaper in Arizona, at $4.44 a gallon against $5.66 in California — a gap of $1.21, or 27.3%. On a 15-gallon fill-up that is $18.18. Figures are AAA daily state averages for 2026-08-02.
Why is gas more expensive in California?
59% of the $1.21 gap is tax rather than the cost of the fuel. California levies $0.71 more per gallon in federal and state taxes; the remaining $0.50 is a genuine difference in what the fuel, refining and distribution cost.
Is diesel cheaper in Arizona or California?
Diesel is cheaper in Arizona at $5.60 a gallon, against $6.93 in California — $1.33 a gallon apart.
Is it worth crossing from California into Arizona to fill up?
If you are already near the line, yes: a 15-gallon fill saves about $18.18. Driving out of your way for it rarely pays — at $5.66 a gallon and 25 mpg, a 40-mile round trip would eat the whole saving in fuel alone, before your time.