Taxes are $0.18/gallon federal, $0.494/gallon state, plus sales tax (which varies by county).

Gas Buddy says Washington has the fourth highest average pump price per state. Some states with low taxes have high prices (e.g., Arizona).

Western states have unique gasoline formulas for air pollution control. Refiners will claim that as a factor in higher fuel prices.

If you can sell all the gasoline you can make at $5/gallon, why would you sell it at $2/gallon?