Expensive gas

Most Expensive States for Gas

The most expensive US gas states are clustered on the West Coast and Hawaii, where state taxes, environmental fuel blends and shipping costs push prices $0.80–$1.50 above the national average.

Updated for 2026
US units
US avg fuel prices
EPA-style MPG
Transparent assumptions

How to read this guide

Examples: Numbers shown in this guide are illustrative estimates, not personalized quotes.
Use the calculators: For exact figures use the linked calculators with your real MPG, miles and local fuel price.
Updated periodically: Content is reviewed against recent EPA, DOE, AAA and EIA references.

Top 10 most expensive states

1) Hawaii, 2) California, 3) Washington, 4) Nevada, 5) Oregon, 6) Alaska, 7) Illinois, 8) Pennsylvania, 9) Arizona, 10) New York. Top 5 average $4.20–$5.00/gal.

Why these states are so expensive

California's $0.78/gal gas tax leads the nation. Hawaii adds inter-island shipping cost. Washington and Oregon face limited refinery access and high environmental fuel standards.

Plan around the cost

Fill up just before crossing into these states and pick high-MPG rentals. Run real numbers with the Fuel Cost Calculator.

Popular routes

LA → San Francisco

SF → Portland

LA → Las Vegas

Seattle → Portland

Browse all road trip routes →

Frequently asked questions

Which US state has the most expensive gas?

Hawaii and California consistently top the rankings, often $1.30–$1.50 above the national average.

Why is California gas so expensive?

Highest state fuel tax in the US (~$0.78/gal), special CARB fuel blend, limited refinery capacity, and cap-and-trade compliance costs.

Should I fill up before entering California?

Yes. Filling in Nevada or Arizona can save $5–$15 per tank.