Diesel Trip Cost Calculator: 2026 Fuel Cost for Any Route
Prefilled at $6.35/gal (EIA national average, updated October 26, 2026). Adjust for your state or enter a local price.
Toggle for return journey
Your Trip
Leg 1 fuel cost$453.71
71.4 gallons$0.907/mile
Total Trip Cost
$453.71
Total fuel cost
71.4
Gallons consumed
500
Total miles
$0.907
Cost per mile
What readers paid at their last fill
Prices readers report from the pump: what they paid, where, and how they paid. Each one is a single fill on the date shown, not a survey average; the weekly EIA figures elsewhere on this page are the survey. The middle of the prices reported here is $6.42.
- $6.98at a gas station in Washington (ZIP 981xx), credit or debit card26 Oct
- $6.30at a gas station in Colorado (ZIP 809xx), credit or debit card26 Oct
- $6.55at a gas station in Colorado (ZIP 811xx), credit or debit card25 Oct
- $6.24at a gas station in Ohio (ZIP 436xx), credit or debit card21 Oct
What did you pay for diesel?
Tell us the price at your last fill and see how it compares with the government survey for your state. Your report goes on this site as a dated reader report; we publish your state and the first three digits of your ZIP, nothing else.
No account, no email. Prices far outside the usual range for your state are checked before they appear. See our privacy policy.
FAQ
How accurate is this diesel trip cost calculator? +
This calculator uses the current EIA national average diesel price ($6.35/gal, updated October 26, 2026) as the default. You can override with any state's price or enter a custom price from your local pump. The fuel cost output is mathematically exact given the inputs: gallons = miles / mpg; cost = gallons x price/gal. Real-world variance comes from your actual mpg (which changes with load, terrain, speed, and headwind) and actual local diesel prices.
What mpg should I use for a diesel semi-truck? +
Class 8 semi-trucks average 6-8 mpg on flat interstate at 65 mph with a loaded trailer. Use 7 mpg as the baseline. For hilly terrain or heavy loads (over 70,000 lbs GVW), use 5-6 mpg. For a partial load or empty run, use 8-10 mpg. These are tested EPA averages from the DOE Smartway and ATA Trucking Efficiency programs. Better aerodynamics (side fairings, trailer skirts, automatic tire inflation) can improve efficiency by 5-10%.
How do I calculate fuel cost for a fleet? +
For fleet-level calculations, use the Fleet Fuel Calculator at /fleet-fuel-calculator. It handles cost per mile, monthly fuel spend for multiple trucks, fuel surcharge calculation (OOIDA methodology), and fleet-card savings overlays. The trip calculator here is optimized for per-route, per-vehicle calculations. For a single truck, multiply the trip cost output by the number of similar trips per month to get a monthly estimate.