Updated April 29, 2026 - EIA Weekly Survey
Diesel Cost per Gallon in Washington (2026)
$5.91/GAL
+0.32 vs US average ($5.59)Rank #48 of 50 statesPADD 5
Diesel Tax Breakdown
Federal diesel excise tax24.4c/gal
Washington state diesel tax49.4c/gal
Total tax73.8c/gal
Tax as % of price1249%
Sources: Federation of Tax Administrators, EIA. Rates as of April 2026.
CALCULATE YOUR FUEL COST IN WASHINGTON
Use our trip calculator prefilled at $5.91/gal for Washington.
Sources: EIA Weekly On-Highway Diesel Fuel Survey, AAA Gas Prices (gasprices.aaa.com), Federation of Tax Administrators diesel tax table. Updated April 29, 2026. State prices are representative averages; actual pump prices vary by retailer and location.