IFTA mileage calculator

Miles per jurisdiction ÷ fleet MPG = taxable gallons. Enter your trip-sheet miles; the worksheet does the division and applies each state's rate.

Getting miles right (the audit part)

Auditors care more about miles than fuel: fuel has receipts, miles are on you. Acceptable records are trip sheets or GPS/ELD logs with odometer readings at state lines or per-trip totals by state. Rounding rule of thumb: record actual odometer miles, not map estimates — a 3% mileage gap is the most common audit adjustment. Total miles include deadhead, bobtail and personal conveyance; they all burn fuel and belong in fleet MPG.

Frequently asked questions

What MPG should I expect?

Loaded Class-8 trucks typically run 5.5-7.5 MPG. If the calculator shows something far off that, a miles or gallons entry is probably wrong — that's exactly the sanity check auditors run.

Do I need odometer readings at every state line?

Best practice, but per-trip state mileage from your ELD or a mileage tool is accepted. Whatever the source, keep it consistent and keep it 4 years.