Semi / Dry Van Cost Per Mile in Idaho

Diesel fuel in Idaho currently averages $4.80 per gallon, which includes a state fuel tax of 32.0¢ per gallon. This fuel tax is near the national average and should be factored into your semi / dry van rate calculations.

Average commercial semi / dry van insurance in Idaho runs approximately $301/month. This moderate premium is typical for the region and should be reviewed annually to ensure you're not overpaying.

Semi trucks average 5.5–7.5 MPG, making fuel the largest single expense — typically 30–40% of total CPM. At these consumption rates, even a $0.20/gallon price difference between states changes your CPM by $0.03–$0.04/mile, which compounds to $300–$450/month at 11,500 miles.

Idaho's growing Boise metro and agricultural exports drive freight demand along I-84 and I-86. Winter conditions on mountain passes require chains and can slow transit times, reducing daily mileage and increasing per-mile costs.

Semi insurance premiums are the highest of any equipment class, reflecting the higher liability exposure and cargo values. Tire costs ($0.04–$0.06/mile), DEF fluid, and DPF maintenance add meaningful variable costs that lighter equipment classes don't face.