Diesel prices are volatile. A 50-cent-per-gallon swing — which can happen in days during supply disruptions — adds up to $77 in fuel costs on a 1,000-mile trip at 6.5 MPG. That's the difference between a profitable load and a break-even one.

Truckers who build fuel price awareness into every load decision consistently outperform those who use a mental average.

How Much Does a Fuel Price Change Actually Cost You?

Here's a simple formula:

Dollar impact = (price change per gallon) × (total miles ÷ MPG)

Example:

Total miles: 1,200
MPG: 6.5
Price change: +$0.40/gallon
Additional fuel cost: $73.85

On a load paying $2,100, that $74 swing moves your net from approximately $400 profit to $326 — a 18.5% reduction in net income from one input change.

Regional Fuel Price Differences Are Significant

Diesel prices vary substantially by state. California consistently runs $0.60–$1.00/gallon above the national average. New England runs high too. Meanwhile, Texas, the Southeast, and Midwest tend to have the lowest prices.

This matters when evaluating loads that route through expensive fuel states. A load that looks great when you price fuel at $3.85/gallon may be much less attractive if the delivery is in California where you'll fill up at $4.80.

Best practice: Use fuel prices for the actual route, not a national average.

Fuel Surcharges: Are You Getting Them?

Some shippers and brokers include fuel surcharges based on the EIA's weekly National Average Diesel Price. These surcharges automatically adjust up or down with fuel costs, protecting your margin.

If you're negotiating directly with a shipper, ask for a fuel surcharge clause tied to the EIA weekly average. This protects you when prices spike and gives the shipper predictability when prices fall.

Load boards typically show the all-in rate. Make sure you know whether a fuel surcharge is included before comparing rates.

Fuel Price Trends to Watch

Seasonal patterns: Diesel typically peaks in spring and fall as farmers consume more fuel and refineries switch to winter blends. Prices often dip in January and February.

Refinery disruptions: A major refinery shutdown — especially in the Gulf Coast — can spike national diesel prices by $0.15–$0.30 in a week.

Crude oil correlation: Diesel tracks crude oil closely but not perfectly. Watch WTI crude oil price as a leading indicator of where diesel is heading.

EIA weekly data: The U.S. Energy Information Administration publishes weekly diesel prices by region every Monday. Bookmarking eia.gov is worth it.

Strategies for Managing Fuel Cost Risk

1. Fuel card discounts. Many fuel cards offer $0.05–$0.40/gallon discounts at participating truck stops. On 100,000 miles per year at 6.5 MPG, even a $0.20 discount saves $3,077 annually.

2. Plan fuel stops strategically. If you're leaving a low-price state and entering a high-price one, top off before the border. The 10–15 minute stop is worth it.

3. Optimize your route for fuel. Some routing decisions save significant fuel cost. Going slightly out of route to avoid California or New England sometimes pencils out.

4. Know your break-even fuel price. For each load, calculate the maximum fuel price that keeps the load profitable. If diesel is approaching that number, you'll want to negotiate a higher rate or pass.

How Haulalytics Handles Fuel Prices

Haulalytics automatically pulls the current regional diesel price for your pickup location and uses it in all calculations. When a more precise price is available (via TomTom station data), it uses that instead. When it's an estimate, the UI clearly labels it so you know the confidence level.

You can also manually override the fuel price if you know you're going to buy fuel at a specific location or price point — just enter the load details and adjust accordingly.

The Takeaway

Fuel is the most dynamic variable in a trucker's P&L. Treating it as a fixed assumption is a mistake that compounds over time. Build the habit of checking current prices before every load decision, and use a calculator that reflects real-time data.