Energy markets have moved quickly as conflict involving Iran and concerns about the flow of crude oil through the Strait of Hormuz create uncertainty across the global supply chain.
The Strait of Hormuz is an important route for global oil shipments. Any disruption, or even the possibility of one, can cause sharp changes in crude oil and refined fuel prices. The situation remains fluid, and prices may continue to react as new information becomes available.

Crude Oil Has Pulled Back From Its Recent Peak
Crude oil has fallen significantly from its recent high of approximately $112 per barrel. Recent pricing has moved into the low $90 range, representing a decline of roughly $20 per barrel from that peak.
That decrease may eventually provide relief for diesel prices, but the effect is rarely immediate. Diesel does not move one for one with crude oil, even though crude is its largest input cost.
Refiners and fuel distributors must work through existing inventory before lower crude prices are fully reflected at the pump. Historically, retail diesel can lag changes in crude oil by one to three weeks.
If lower crude prices hold, diesel may continue to ease during the weeks ahead. However, renewed supply concerns, refinery conditions, regional demand and additional geopolitical developments could change that direction quickly.
What Lower Diesel Can Mean for Trucking Costs
Fuel is one of the largest operating expenses for a trucking company. Even a modest change in the price per gallon can make a noticeable difference in the cost of operating a truck.
Consider a typical truck traveling between 2,500 and 3,000 miles each week with average fuel economy of about 6.8 miles per gallon. That truck may consume roughly 370 to 440 gallons of diesel per week. A ten cent decrease in diesel could reduce weekly fuel expense by approximately $37 to $44 per truck. Over a month, that equals roughly $150 to $175.
If diesel falls by fifty cents per gallon, the estimated savings could reach approximately $185 to $220 per week, or $750 to $900 per month for one truck. For a fleet of 50 trucks, that same fifty cent change could represent roughly $37,500 to $45,000 in monthly fuel savings.
These figures are examples rather than guaranteed savings. Actual fuel costs depend on mileage, fuel economy, idling, equipment type, location, purchasing programs and other operating factors.
Why Freight Rates May Remain Firm
Customers often ask a reasonable question: If diesel prices are falling, why are freight rates not falling too? The answer is that fuel is only one part of the total transportation rate. An all in freight rate generally includes a linehaul charge and a fuel surcharge.
When diesel prices decline, the fuel surcharge may also decline. At the same time, linehaul pricing can rise when truck capacity becomes tighter. If linehaul costs increase faster than the fuel surcharge falls, the total freight rate may remain steady or even move higher.
That is an important distinction in the current market. Fuel expenses may be easing, but tender rejection rates and competition for available trucks are keeping pressure on linehaul pricing. The market is being influenced less by energy costs alone and more by the availability of capacity.
Lower diesel can improve carrier operating margins, but it does not automatically create lower transportation rates. Truck availability, shipment demand, lane balance and service requirements still play a major role in pricing.
Following the National Diesel Average

The United States Energy Information Administration publishes national and regional diesel price data each week. The national average is widely used as a benchmark for calculating fuel surcharges on contracted freight.

Many transportation contracts use a fuel surcharge schedule tied to the national diesel average. As the published price rises or falls, the surcharge adjusts according to the terms of the agreement. This allows a contract to respond to fuel market changes without requiring the full transportation rate to be renegotiated every time diesel moves.
The relationship is simple: the linehaul charge plus the fuel surcharge equals the all in transportation rate.
The latest national diesel price and regional averages are available through the United States Energy Information Administration. The agency typically updates its retail fuel price data each week.
What Shippers Should Watch Next
Diesel prices remain an important part of transportation costs, but they should not be viewed in isolation. Shippers should watch fuel trends alongside tender rejection rates, spot pricing and truck availability.
If diesel continues to decline while capacity tightens, fuel surcharges may ease even as linehaul rates remain firm or move higher. If energy prices reverse course while truck availability remains limited, total transportation costs could increase more quickly.
Advance planning, accurate forecasts and flexible pickup schedules can help reduce exposure to sudden pricing changes. Understanding the separate roles of fuel and linehaul also makes it easier to evaluate transportation rates and build more realistic budgets.
IEL will continue monitoring diesel prices, energy market developments and truckload capacity to help customers understand how these changes may affect their freight.
Learn more about how Integrity Express Logistics can help you navigate these roads.
Author
Brian Seven – Sales Engagement Manager
