Cost Per Mile to Operate a Truck in Washington (2026)
What it actually costs owner-operators to run a semi-truck in Washington — diesel, insurance, IFTA, and freight market notes for WA.
Diesel prices in Washington
The average diesel price in Washington is roughly $4.55/gal. For a truck running 8,000 miles/month at 6.5 MPG, that's about $5,600/month in fuel alone — or roughly $0.70/mile. Fuel is typically 30–40% of total cost per mile, so Washington's diesel price has a major impact on whether a load is profitable.
Trucking insurance in Washington
Washington insurance averages $11,500–$15,500/yr. Annual premiums vary widely based on CDL history, equipment age, and operating radius.
WA IFTA and fuel taxes
Washington IFTA fuel tax: 49.4¢/gal diesel. File quarterly and keep accurate trip mileage records by jurisdiction to stay compliant.
Freight market in Washington
Seattle/Tacoma ports, aerospace (Boeing), and produce from the Yakima Valley.
How to lower your cost per mile in Washington
- Track diesel by region — refuel where the all-in price (pump + state tax) is lowest.
- Negotiate fuel surcharge into every contract using a clear formula tied to the DOE index.
- Reduce deadhead — a 20% deadhead ratio adds 25% to your effective cost per loaded mile.
- Run our Cost Per Mile Calculator monthly with real receipts, not estimates.