Cost Per Mile to Operate a Truck in Illinois (2026)
What it actually costs owner-operators to run a semi-truck in Illinois — diesel, insurance, IFTA, and freight market notes for IL.
Diesel prices in Illinois
The average diesel price in Illinois is roughly $4.10/gal. For a truck running 8,000 miles/month at 6.5 MPG, that's about $5,046/month in fuel alone — or roughly $0.63/mile. Fuel is typically 30–40% of total cost per mile, so Illinois's diesel price has a major impact on whether a load is profitable.
Trucking insurance in Illinois
Illinois insurance averages $12,000–$16,000/yr; Cook County drives rates higher. Annual premiums vary widely based on CDL history, equipment age, and operating radius.
IL IFTA and fuel taxes
Illinois IFTA fuel tax: 67¢/gal diesel (one of the highest). File quarterly and keep accurate trip mileage records by jurisdiction to stay compliant.
Freight market in Illinois
Chicago is the #1 US rail/truck intermodal hub; tolls, congestion, and CDL strict enforcement.
How to lower your cost per mile in Illinois
- 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.