Diesel Fuel Cost Calculator

Despite higher fuel prices, diesel engines are 25-35% more efficient than gasoline. A diesel getting 35 MPG at $4.10/gal costs $0.117/mile, while a gas car getting 27 MPG at $3.50/gal costs $0.130/mile — diesel is slightly cheaper per mile.

Light-duty diesel trucks average 20-25 MPG highway. Heavy-duty pickups get 15-22 MPG. Semi-trucks average 5-8 MPG. Modern diesel technology has significantly improved efficiency across all categories.

Diesel is taxed at a higher rate, has higher refining costs, and faces increased demand from commercial trucking and heating oil. Despite the higher per-gallon cost, the better fuel economy often makes diesel cheaper per mile.