The Weekly Fill-Up | October 26-30

October 26, 2026

As October comes to a close, the U.S. fuel industry is operating at a pace not seen in decades, but keeping up with demand remains a challenge.

New federal data shows American refineries have been processing crude oil at unusually high rates throughout 2026. Despite that increased production, Midwest diesel inventories continue to decline. Meanwhile, corn harvest is running behind its normal pace, and propane supplies are beginning to shift toward winter consumption.

For Sioux Valley Coop members, these developments provide a clearer picture of why fuel prices remain under pressure and what could influence energy needs heading into November.

U.S. Refineries Are Working Harder Than They Have in Decades

One of the biggest developments this week came from the U.S. Energy Information Administration on October 22.

According to the agency, U.S. refineries operated at an average of more than 95% of capacity between May and September 2026. That’s the highest utilization rate for those months since 1998.

For comparison, refineries have historically operated at an average of approximately 92% of capacity during the same period.

Why are refineries running so hard?

Much of the answer comes down to diesel.

Tight international supplies have increased demand for U.S.-produced distillate fuels, encouraging American refineries to maximize production. Strong refining margins have also provided financial incentives to keep facilities operating at elevated rates.

However, there’s an important detail behind these numbers.

Even though refineries are operating at historically high percentages of their available capacity, total U.S. refining capacity has declined approximately 4% compared with earlier years.

That means higher utilization doesn’t necessarily translate into record production.

For diesel customers, this helps explain why strong refinery activity hasn’t automatically resulted in lower prices or rapidly growing inventories. Domestic agricultural and transportation demand must compete with international buyers for finished diesel supplies.

Midwest Diesel Inventories Continue to Decline

The latest inventory figures reinforce the importance of that distinction.

According to the EIA’s October 21 Weekly Petroleum Status Report, U.S. distillate fuel inventories increased from approximately 102.6 million barrels to 104.3 million barrels during the week ending October 16.

That’s a welcome national improvement.

But the Midwest moved in the opposite direction.

Regional distillate inventories declined from approximately 25.7 million barrels to 25.3 million barrels.

Looking back to September 11, Midwest inventories stood at approximately 28.8 million barrels. They’ve now declined by more than 3.5 million barrels in just over a month.

This is an important development for agricultural producers.

National inventory growth can indicate that refiners are producing more fuel, but it doesn’t necessarily mean every region is experiencing the same improvement in availability.

The Midwest continues to support significant diesel demand from agriculture, trucking, construction, and other industries.

With harvest still underway, those demands remain especially relevant.

For Sioux Valley Coop’s bulk fuel customers, the latest numbers demonstrate why regional supply conditions deserve attention alongside national energy headlines.

Corn Harvest Is Falling Further Behind Its Normal Pace

The latest USDA Crop Progress report, released October 19, showed that 44% of the nation’s corn crop had been harvested as of October 18.

That’s eight percentage points behind the five-year average of 52%.

Soybean harvest was further along, reaching 64% complete, just one percentage point behind its historical average.

The difference between the two crops matters for fuel and propane demand.

Soybeans are generally harvested and stored at moisture levels that require less artificial drying than corn. Corn, particularly when harvested at higher moisture levels, can require substantial amounts of propane to reach safe storage conditions.

With more than half of the nation’s corn crop still standing as of the latest report, significant harvesting and grain-handling activity remains ahead.

For South Dakota producers, actual field conditions will determine how that remaining work translates into energy consumption.

If weather allows corn to continue drying naturally, propane requirements may be reduced. If harvest conditions deteriorate or colder temperatures arrive, grain-drying operations could become more active.

Either way, the delayed national harvest pace suggests agricultural fuel demand may extend further into November than some operations initially anticipated.

Propane Inventories Are Beginning Their Seasonal Transition

The propane market is also showing signs of change.

According to EIA data for the week ending October 16, U.S. propane and propylene inventories totaled approximately 105.8 million barrels, down about 529,000 barrels from the previous week.

Although inventories declined, national supplies remained approximately 2.7 million barrels above the same period last year.

That’s an encouraging position as the heating season approaches.

The shift is important because propane demand typically changes considerably between summer and winter.

During warmer months, propane production often exceeds domestic consumption, allowing inventories to build. As grain drying and residential heating demand increase, those stored supplies begin serving a much larger role.

The challenge is that seasonal demand doesn’t develop evenly across the country.

Some regions may experience warmer temperatures and relatively modest consumption, while others encounter colder weather or concentrated agricultural demand.

For Sioux Valley Coop members, the overall supply picture remains reassuring, but weather and grain moisture will be important factors in determining how quickly propane is consumed over the coming weeks.

Why November Could Be a Different Month for Fuel Demand

The transition from October into November is about more than colder temperatures.

For many agricultural operations, November brings a change in how equipment is used.

Fieldwork may begin winding down, but grain hauling, transportation, livestock operations, and winter preparation continue consuming diesel.

At the same time, the broader fuel industry begins responding to heating-related demand and seasonal refinery operations.

Refineries often conduct maintenance during periods of lower demand, but this year’s elevated operating rates have made production schedules especially important.

If refineries reduce output while inventories remain relatively tight, the market could become more sensitive to unexpected disruptions.

On the other hand, continued strong production could help replenish supplies as harvest demand gradually decreases.

Neither outcome is guaranteed.

The important consideration is that diesel prices and availability are influenced by several moving parts, and the transition into November doesn’t necessarily mean fuel demand will immediately disappear.

Bulk Oil: Preparing Equipment for the End of Harvest

Late October also presents an opportunity to think about equipment maintenance from a different perspective.

Rather than focusing only on keeping machinery running through harvest, producers can begin considering what needs attention once fieldwork is complete.

Combines, tractors, grain carts, and trucks may have accumulated hundreds of operating hours throughout the season.

Those hours create wear on engines, hydraulic systems, transmissions, and other components that depend on proper lubrication.

Completing recommended maintenance before equipment enters extended storage can help protect those systems and identify potential problems before the next busy season.

For equipment that will continue operating through winter, lubricant selection becomes especially important as temperatures fall.

Cold-weather performance depends on using products that meet manufacturer specifications for viscosity and operating conditions.

Sioux Valley Coop offers Cenex lubricants and bulk oil products to support agricultural and commercial equipment needs throughout the year.

Keeping accurate maintenance records and reviewing lubricant inventory as harvest winds down can help operations transition more smoothly into winter.

Looking Ahead: Production, Weather, and Remaining Harvest Demand

As October concludes, three developments will be especially important to watch.

First, U.S. refineries are producing fuel at historically high utilization rates, but the Midwest continues experiencing declining diesel inventories. Whether those regional supplies begin recovering will be an important indicator for the weeks ahead.

Second, a significant portion of the nation’s corn crop remains unharvested. The pace of fieldwork and the moisture content of the remaining crop will help determine how much additional diesel and propane agriculture consumes before winter.

Finally, propane is entering the heating season with inventories above last year’s levels, providing a useful supply cushion as demand increases.

For Sioux Valley Coop members, the coming weeks represent a transition rather than an immediate end to seasonal energy needs.

Harvest may be approaching its final stages for some operations, but fuel transportation, grain drying, equipment maintenance, and winter heating will continue shaping demand well into November.

Understanding those changing conditions helps put the larger energy market into perspective and reinforces the importance of dependable local fuel, propane, and lubricant services.

Sources

U.S. Energy Information Administration (EIA) – U.S. Refinery Utilization Analysis, October 22, 2026
U.S. Energy Information Administration (EIA) – Weekly Petroleum Status Report, October 21, 2026
U.S. Energy Information Administration (EIA) – Stocks of Distillate Fuel Oil, week ending October 16, 2026
U.S. Energy Information Administration (EIA) – Heating Oil and Propane Update, week ending October 16, 2026
USDA National Agricultural Statistics Service (NASS) – Crop Progress Report, October 19, 2026
Reuters – U.S. Refiners Have Run Harder in 2026 as Tight Diesel Supplies Boost Margins, October 22, 2026
DTN Progressive Farmer – USDA Crop Progress: Corn 44% Harvested, Soybeans 64% Harvested, October 19, 2026