Trip Fuel Cost Calculator
Miles, MPG, price — that's the whole equation. The diesel price below is the latest verified EIA U.S. average, for the survey period 2026-10-19.
How this is calculated
gallons = miles ÷ MPG
fuel cost = gallons × price per gallon
Price source: EIA Gasoline and Diesel Fuel Update. EIA normally releases prices around 10 a.m. Eastern on Tuesdays, or Wednesdays after a Monday federal holiday.
FAQ
How much does it cost to fuel a semi truck per mile?
At the latest verified EIA national average of $6.276/gallon (survey period 2026-10-19) and 6.5 MPG, fuel costs about $0.97 per mile. Your number moves with diesel prices and your truck's real-world MPG.
How many gallons does a semi use per 100 miles?
A loaded Class 8 truck at 6.5 MPG burns about 15.4 gallons per 100 miles. Idling, terrain, and load weight push that up.
Where does the diesel price in this calculator come from?
The default is the latest verified EIA U.S. On-Highway Diesel Fuel Price. EIA normally releases prices around 10 a.m. Eastern on Tuesdays, or Wednesdays after a Monday federal holiday. You can type over it with your actual pump price.
Does this include DEF cost?
No. DEF typically adds 2-3% of fuel spend; add it on top if you want a fully loaded number.
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Fuel surcharge calculator · Cost per mile · Latest verified diesel prices
Survey week of: 2026-10-19 · Source: EIA weekly diesel