Oil prices make the headlines. Diesel comes out of your trucking budget. Your diesel fuel cost per mile tells you more about a load than a one-day oil-price headline.

For an owner-operator, the important question is: “After fuel, empty miles and other expenses, how much does this load leave me?” This easy-English guide explains the numbers for flatbed, step deck and stretch flatbed operators.

Why can diesel stay expensive when oil prices fall?

Crude oil is the raw material used to make diesel, but it is only part of the pump price. Refining, transportation, distribution and taxes also affect what you pay. Refinery problems or tight diesel supplies can keep prices high even when crude becomes cheaper. Seasonal farming and heating demand can add pressure.

A lower oil price does not guarantee an immediate drop at your next fuel stop. Read the EIA explanation of what affects diesel prices.

Can events overseas affect U.S. diesel prices?

Yes. Oil and fuel move through international markets. The International Energy Agency identifies the Middle East conflict, Ukrainian attacks on Russian refineries and limited global refining capacity as factors behind recent diesel-price pressure. Its diesel-market discussion explains the connections.

The practical takeaway: disruptions overseas can affect costs here, but a news headline cannot tell you exactly what diesel will cost next week. Build your load calculation around current fuel costs, not a hoped-for price drop.

The diesel-price snapshot

Historical snapshot: EIA release September 15, 2026, covering September 14. These are not live prices.

Area	Average diesel price	Weekly change
United States	$6.285/gallon	+31.8 cents
Midwest	$6.250/gallon	+30.4 cents

These retail averages include taxes. Your pump price or discounted fuel-card price may differ. Check the latest dated release in the EIA Gasoline and Diesel Fuel Update before quoting a load.

How to calculate diesel fuel cost per mile

Fuel cost per mile = diesel price per gallon ÷ miles per gallon.

At an illustrative $6.00 per gallon, a truck getting 5 MPG spends $1.20 per mile on fuel. At 6 MPG it spends $1.00. At 7 MPG it spends about $0.86. These are calculations, not fleet averages. Use measured fuel economy from similar work.

At 6 MPG, a 3,000-mile week uses approximately 500 gallons. Every 50-cent increase per gallon adds $250 to that week’s fuel bill. That leaves $250 less from the same revenue unless compensation rises or other costs fall.

Fuel is only one expense. Truck payments, maintenance, tires, insurance and other business costs still need to be covered. Include idling and auxiliary fuel use in your actual records; mileage-based estimates can miss them.

Empty miles can change the load’s value

Deadhead means miles driven without a paying load. Imagine a trip with a $3,000 total payment to your business, including any fuel payment. It has 1,000 loaded miles and 200 empty miles.

The offer looks like $3.00 per loaded mile. But you drive 1,200 miles, so revenue is $2.50 per total mile.

At an assumed 6 MPG and $6.00 diesel, estimated fuel is 200 gallons, costing $1,200. That leaves $1,800 before all other expenses and owner compensation—not $1,800 profit. Leaving empty miles out would underestimate fuel by $200.

For more on checking the complete trip, read our flatbed rates and driver-profit guide.

Does a fuel surcharge cover the increase?

Not necessarily. A fuel surcharge is an additional payment calculated under agreed terms. EIA publishes diesel prices, but does not set or regulate surcharges. Companies negotiate their own methods. See the EIA fuel-surcharge FAQ.

Before accepting a load or operating agreement, ask:

• Is fuel included in the quoted rate or paid separately?
• Which price index and update date are used?
• What MPG does the calculation assume?
• Which miles qualify?
• What amount reaches my settlement?

Our trucking fuel-surcharge guide explains the calculation. Do not add a surcharge twice when comparing an all-in offer.

What should flatbed, step deck and stretch operators check?

A higher-paying load is not automatically a better-paying trip. Check these five things before saying yes:

• The actual route: include empty travel and any permit-required route changes.
• The load and equipment: use fuel consumption from comparable trips instead of assuming every shipment gets the same MPG.
• Loading and unloading time: securement, tarping and waiting affect how much work you can complete.
• Special costs: account for permits, escorts and other shipment-specific expenses where applicable.
• The next load: a strong outbound payment can lose its advantage after a long empty drive.

Ask: “What will the complete trip leave after costs, and how much time will it take?”

Company driver or owner-operator? Ask different questions

If you are a company driver, your pay depends on your agreement, not simply the truck’s fuel bill. Ask whether you are paid per mile, by percentage or another method.

If you receive percentage pay, ask: percentage of what? Is the fuel surcharge included? Which deductions apply?

If you are an owner-operator or lease operator, ask for a sample settlement showing revenue, fuel purchases, fees and deductions. A large gross-revenue number is not take-home money.

• Gross revenue: money earned before expenses.
• Settlement: the statement showing payments and deductions.
• Net business profit: revenue minus business expenses; clarify how owner compensation and taxes are treated.

Useful links: track oil and diesel prices

• EIA weekly diesel prices: compare national and regional retail averages. Check the observation date. This is a benchmark, not your fuel-card quote.
• EIA crude-oil and petroleum spot prices: follow WTI and Brent crude, plus wholesale diesel. Crude is quoted per barrel and fuel products per gallon. These are historical observations, not live pump prices.
• IEA diesel-market explainer: understand the international supply and refining story behind the numbers.
• Your fuel-card app and receipts: use your actual discounted price and fees for trip planning. Compare it with the benchmark, rather than assuming you pay the national average.

A simple routine: check the newest diesel release, confirm your actual purchase price, then update your cost per mile before choosing the next load. Oil prices provide context; your fuel bill decides the expense.

Frequently asked questions

Will diesel immediately get cheaper when oil falls?

Not necessarily. Refining, fuel availability, distribution and taxes also affect diesel prices. Do not assume a one-day oil-price drop will immediately reach the pump.

How much does a 50-cent diesel increase cost a truck?

At 3,000 miles and 6 MPG, the truck uses 500 gallons. A 50-cent increase adds $250 in fuel expense. Different mileage and MPG produce different results.

Should I include empty miles in fuel costs?

Yes. Estimate fuel for both loaded and empty travel. For more accuracy, use separate MPG estimates when fuel consumption differs between them.

Does a higher flatbed rate mean more take-home money?

No. Check fuel, all miles, time, other operating expenses and the next reload. A higher rate can still leave less money.

Does every driver receive the fuel surcharge?

Do not assume that. Ask how the surcharge is handled under your pay or operating agreement and check the settlement.

The bottom line

Watch oil news for context. Use diesel prices and your truck’s numbers to make decisions. Before accepting a load, write down total payment, all miles, expected gallons, other costs and time required. The best-looking rate is not always the best business decision.

Looking for your next open-deck opportunity?

TA Trans works with experienced company drivers and owner-operators hauling flatbed, step deck and stretch trailer freight. Explore the available paths, then ask our recruiting team about pay, fuel treatment, deductions and operating expectations.

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Examples are educational, not earnings guarantees. Use your actual costs and agreed compensation terms.