Fuel Cost Calculator

The average fuel economy for a Class 8 semi truck is between 5.5 and 7.0 MPG depending on the truck age, engine, load weight, terrain, and driving habits. Newer trucks with aerodynamic features and modern engines typically get 6.5-7.0 MPG, while older trucks may get 5.5-6.0 MPG.

At an average of 6.5 MPG and $5.26/gallon diesel (EIA, week of August 10, 2026), fuel costs about $0.81 per mile. This varies significantly based on your truck's fuel economy and current diesel prices. Fuel typically represents 25-35% of an owner-operator's total operating costs.

Key strategies include maintaining proper tire pressure, reducing idle time, driving at consistent speeds (55-62 MPH is optimal), using cruise control on highways, keeping up with engine maintenance, reducing unnecessary weight, and planning routes to avoid mountains and heavy traffic when possible.