Updated October 1, 2026
Diesel finally blinked. The U.S. Energy Information Administration (EIA) reported that the national average on-highway diesel price fell 14.7 cents to $6.382 per gallon for the week of September 28, after hitting a record $6.529 the week before. That is the first weekly decline since the end of August. It is welcome news for every owner-operator, but it is not yet a return to normal: diesel is still about $2.63 a gallon above this time last year.
Here is what is behind the move, where prices are highest, what it costs you per 1,000 miles, and what to do about it. For the bigger picture of how we got here, read our earlier breakdown of the September diesel record and what it means for owner-operator rates.
Diesel Prices by Region (EIA, Week of September 28, 2026)
| Region | Price per gallon | Change vs. last week |
|---|---|---|
| U.S. national average | $6.382 | Down 14.7 cents |
| Gulf Coast | $5.955 | Down 22 cents |
| East Coast | $6.137 | Down 13 cents |
| Rocky Mountain | $6.407 | Up 7 cents |
| Midwest | $6.526 | Down 15 cents |
| West Coast | $7.357 | Down 10 cents |
| California | $8.181 | Down about 6.5 cents |
The spread matters. Fuel on the Gulf Coast is roughly 57 cents cheaper than in the Midwest and more than $2.20 cheaper than in California. See the EIA weekly price table for the latest numbers every Monday.
Why Diesel Spiked and Why It Eased
Diesel has climbed about 85% from its January low of $3.459. Most reporting ties the surge to the war involving Iran and the uncertainty around the Strait of Hormuz, which has kept crude oil volatile, with Brent back above $106 a barrel this week according to FleetOwner. But crude is only part of the story. Diesel prices also depend on refining margins, inventories, distribution costs and taxes.
This week’s drop followed softer wholesale diesel and some improvement in Middle East crude exports, including more Saudi shipments moving through the East-West pipeline, as reported by Reuters and summarized by Ag Bull. At the same time, EIA data showed U.S. distillate inventories running about 12% below the five-year seasonal average for the week ended September 18, and refinery utilization slipped to around 94%. Tight inventories are one reason diesel has stayed so high even when crude pulls back.
Is the Worst Over?
It is too early to say. One weekly decline is a break in the trend, not a reversal. The EIA number is a Monday snapshot, so it can lag what is happening at wholesale. Several things could move prices from here:
- Policy moves: the White House has reportedly asked the European Union to release emergency diesel stocks, and the Department of Energy has re-opened an offer to loan up to 40 million barrels of crude from the Strategic Petroleum Reserve. Crude loans do not add diesel directly, so the effect depends on how much refiners take and how much extra diesel they make.
- Diplomacy: talks over the Strait of Hormuz keep swinging, and analysts warn that if they fail, crude could climb much higher.
- Regional shocks: the Rocky Mountain region actually rose this week, and Texas has reportedly declared a 30-day disaster over fuel costs. If you run in Texas, check official state sources before relying on any fuel-rule waiver, because using dyed diesel on public roads can carry penalties if it is not clearly covered.
What Diesel Costs You per 1,000 Miles
Using a simple example of a truck averaging 6.5 miles per gallon (about 154 gallons per 1,000 miles; your own mpg will change the numbers):
| Week | Diesel price | Fuel cost per 1,000 miles |
|---|---|---|
| August 31 | $5.599 | About $861 |
| September 21 (record) | $6.529 | About $1,005 |
| September 28 | $6.382 | About $982 |
The latest drop saves roughly $23 per 1,000 miles, but you are still paying about $120 more than you were at the end of August. Over a month of steady running, that is real money coming out of your take-home pay. For a full picture of your numbers, see our guide to owner-operator trucking costs.
What Owner-Operators Should Do Now
- Price every load on today’s diesel. Do not use last month’s cost per mile. Recalculate your break-even using the current EIA number and your real mpg.
- Look at all-in rates. Confirm whether a broker’s number includes the fuel surcharge and which diesel price it is based on. Surcharges can lag the market by about a week.
- Plan your fuel stops. With a 57-cent gap between the Gulf Coast and the Midwest, filling up in the cheaper region before you head out can save real money on a 100-gallon fill. Our fuel cost management guide covers fuel cards and discount networks.
- Cut deadhead. Surcharges generally pay on loaded miles, so empty miles are on you. Read how to reduce deadhead miles.
- Negotiate, do not just accept. Carrier capacity is tight, which gives you more leverage than you may think. Use our guide to negotiating freight rates.
Related reading: Fuel Surcharges Explained: How Owner-Operators Protect Their Margin and Freight Market Update October 2026: Spot Rates, Capacity and Diesel.
How a Dispatcher Helps When Fuel Is This Expensive
When diesel moves every week, the difference between a good load and a bad one gets bigger. A dispatcher compares all-in rates, plans the next load before you deliver, and negotiates with brokers so you are not covering fuel out of your own pocket. See how a truck dispatcher saves you money, or learn more about our owner-operator dispatch service. Nexloads books loads, negotiates rates and handles paperwork with no forced dispatch. Contact us for a free quote.
Sources: U.S. Energy Information Administration weekly diesel survey, FleetOwner (September 30, 2026), Ag Bull Trading (September 29, 2026), Logistics Management (September 29, 2026). Prices change weekly; check the latest EIA numbers before making financial decisions.