Oil prices returned above $100 a barrel on September 9, putting fuel-sensitive U.S. businesses back under cost pressure. Brent crude crossed the threshold as global supply disruptions persisted, while diesel approached $6 a gallon nationally. Transportation, manufacturing and aviation are among the sectors facing the clearest exposure to higher energy expenses.

Key Takeaways

• Brent crude moved above $100 a barrel on September 9, while U.S. West Texas Intermediate remained near $95.
• EIA data showed U.S. on-highway diesel averaging $5.967 a gallon for the week ending September 7.
• Regular gasoline averaged $4.157 a gallon nationally during the same week.
• The IEA expects global oil supply to decline by 4.3 million barrels per day in 2026.
• Transportation, manufacturing and aviation face different levels of exposure depending on fuel use, contracts and their ability to pass along higher costs.

Oil Prices Push Energy Costs Back Into Focus

Oil prices crossed an important market threshold Wednesday when Brent crude, the global benchmark, moved above $100 a barrel for the first time since late July. Brent traded around $100.72 during the session, while West Texas Intermediate rose to roughly $95.25.

The difference between the two benchmarks matters for U.S. businesses. The headline $100 figure applies to Brent rather than the primary U.S. crude benchmark, but movements in global crude markets can still influence refined fuels, transportation rates and petroleum-based materials used across domestic supply chains.

The bigger concern for many companies is not the round number itself. It is the combination of elevated crude prices and already expensive refined fuels.

EIA data released September 9 showed regular gasoline averaging $4.157 a gallon nationally for the week ending September 7, up from $4.071 a week earlier. On-highway diesel rose more sharply, reaching $5.967 a gallon from $5.599 the prior week.

Those figures put fuel costs directly into operating budgets for trucking fleets, delivery companies, construction contractors, farms and other businesses that depend heavily on diesel.

Diesel Is the Immediate Pressure Point

Diesel has become one of the clearest transmission points between higher oil prices and U.S. business expenses.

Unlike gasoline, which is closely associated with household driving, diesel sits deep inside commercial supply chains. Trucks carrying food and consumer products, agricultural machinery, construction equipment and portions of the freight network all depend on the fuel.

S&P Global Energy reported that U.S. East Coast diesel inventories had fallen to exceptionally low levels as September began. The pressure helped lift diesel refining margins in both the United States and Europe, reflecting a market in which producing enough refined fuel has become as important as access to crude itself.

That distinction matters for companies planning freight budgets. Crude prices can fall without producing an equivalent decline in diesel if refinery capacity, inventories or regional supply remain constrained.

For logistics providers, higher fuel bills can lead to adjustments in fuel surcharges. Shippers and retailers may then encounter higher transportation expenses depending on their contracts and delivery networks.

The effect can spread beyond companies that directly purchase diesel. Businesses already tracking broader factory energy costs may also have to account for higher freight expenses when evaluating total operating costs.

Manufacturers and Airlines Face Uneven Exposure

Manufacturers face several possible channels of higher energy costs.

Petroleum is used not only as fuel but also as an input across chemicals, plastics, packaging and other industrial products. Companies that rely on these materials can encounter cost changes through suppliers even if their own facilities use relatively little petroleum.

Transportation adds another layer. Raw materials must reach factories, and finished goods must move to distributors and customers. Rising diesel expenses can therefore affect manufacturers through both inbound and outbound logistics.

The impact will vary significantly by industry, location and contract structure. Companies with long-term fuel or transportation agreements may experience changes more gradually, while businesses purchasing fuel or freight services closer to prevailing market rates can encounter them sooner.

Airlines face a separate exposure through jet fuel.

IATA’s fuel monitor, which uses S&P Global Energy data, showed the global average refinery price for jet fuel at $146.93 a barrel in its latest available weekly reading. The figure highlights the gap that can emerge between crude benchmarks and the refined products airlines actually purchase.

Fuel is only one part of airline expenses, and individual carriers use different purchasing and hedging approaches. Still, prolonged strength in jet fuel can influence route economics, capacity decisions and operating costs.

Energy producers and refiners can experience a different financial effect. Higher crude selling prices or stronger refining margins may support revenue in parts of the energy sector even as fuel-consuming businesses face higher expenses.

Supply Disruptions Keep Refined Fuels Tight

The current oil price increase comes against an unusually constrained global supply backdrop.

The International Energy Agency said in its August Oil Market Report that global oil supply was forecast to decline by 4.3 million barrels per day in 2026 to about 102 million barrels per day. Production growth from the Americas was expected to offset only part of the losses elsewhere.

The IEA also said tight product markets pushed Atlantic Basin refining margins to record levels in July as diesel, gasoline and jet fuel supplies faced pressure from supply shortfalls and depleted inventories.

That helps explain why businesses may need to monitor more than crude prices.

Commercial operators increasingly have reason to watch diesel inventories, refinery output, regional fuel prices and freight surcharges alongside Brent and WTI. Earlier U.S. crude inventory data also illustrates how weekly supply reports can provide an early indication of changing conditions in domestic petroleum markets.

The EIA’s next weekly petroleum supply report is scheduled for September 10 after a holiday-related delay. That release will provide updated figures for commercial crude, gasoline and distillate inventories.

For corporate finance and procurement teams, the duration of the increase remains central. A short-lived crude spike can produce a different business impact from several weeks of elevated diesel, gasoline and jet fuel prices.

Companies with fuel-intensive operations may review transportation contracts, fuel surcharges, supplier terms and production costs more closely as the quarter progresses. Consumer-facing businesses also face indirect exposure because higher household fuel expenses can reduce the amount available for other purchases.

Oil prices above $100 therefore matter less as a standalone milestone than as one part of a wider cost picture. With U.S. diesel near $6 a gallon, gasoline above $4 and refined-product markets still tight, transportation and energy expenses have become more prominent variables in business budgeting.

Frequently Asked Questions

Why did oil prices rise above $100 a barrel?

Brent crude moved above $100 on September 9 as markets responded to continued disruptions affecting global oil supply and transportation routes. The IEA had already reduced its 2026 global supply outlook amid persistent constraints.

Did U.S. oil also trade above $100?

No. The $100 milestone referred to Brent crude, the international benchmark. West Texas Intermediate, the main U.S. benchmark, remained around the mid-$90s during the September 9 price increase.

How high are U.S. diesel prices?

The EIA reported an average U.S. on-highway diesel price of $5.967 per gallon for the week ending September 7, 2026. That was up from $5.599 the previous week.

How do higher oil prices affect U.S. businesses?

Higher oil prices can feed into diesel, jet fuel, freight, manufacturing inputs and other operating expenses. The effect differs by sector and can depend on fuel contracts, logistics arrangements and how quickly businesses can adjust their pricing.

Which businesses are most exposed to higher fuel costs?

Transportation, logistics, aviation, construction, agriculture and fuel-intensive manufacturing can face more direct exposure. Businesses that rely heavily on shipping can also encounter higher costs indirectly through freight providers.