Washington's statewide average reached $5.51, versus $4.18 nationally, leaving Seattle drivers paying $1.54 more per gallon than the US average.
The report says the state's Climate Commitment Act adds an estimated 52 to 57 cents a gallon, on top of Washington's 55.4-cent gas tax, while the Iran war disrupts oil flows through the Strait of Hormuz.
Analysts warn West Coast prices could hit $8 if the conflict worsens, as Republican lawmakers press for emergency action and Washington's gas tax is due to rise another 2% on 1 July.
With Seattle gas prices hitting new records, what lasting changes could drivers and businesses face if global oil disruptions and state policies persist?
If the Iran conflict and Strait of Hormuz closure continue, how might Washington's climate policies evolve to address both environmental goals and public affordability?