Why Are Diesel Prices So High in the U.S.? What Drivers and Businesses Need to Know

Why Are Diesel Prices So High in the U.S.? What Drivers and Businesses Need to Know

Short Excerpt

U.S. diesel prices have surged to record levels in 2026, with the national average topping $6 a gallon for the first time ever. Here's what's really driving the spike — from Russian refinery strikes to tight U.S. inventories — and what it means for truckers, farmers, and everyday drivers.

Introduction

If you've filled up a diesel pickup, run a trucking fleet, or watched your grocery bill creep upward in 2026, you've likely felt it: diesel is expensive — historically expensive. As of the week of September 14, 2026, the U.S. Energy Information Administration's (EIA) weekly survey put the national average price for on-highway diesel at $6.285 per gallon, a level that has never been recorded in the survey's history dating back to 1994. Just a week earlier, diesel had already broken the previous all-time nominal high of $5.810 per gallon, set back in June 2022.

For comparison, regular gasoline — the fuel most Americans watch closely — was averaging around $4.16 per gallon in the same period. That's a gap of roughly $2 a gallon between diesel and gasoline, an unusually wide spread that reflects forces specific to the diesel market rather than oil prices in general.

This matters far beyond the pump. Diesel is the backbone fuel of the American economy: it powers roughly 80% of the freight moved by truck, most of the country's farm equipment, construction machinery, freight trains, and marine vessels. When diesel prices rise this sharply, the costs don't stay contained to truckers — they ripple into the price of food, building materials, retail goods, and virtually everything that gets shipped somewhere before it reaches you.

This article breaks down exactly why diesel has become so expensive in 2026, how it compares with past price spikes, which regions are hit hardest, what it means for drivers and business owners, and what (if anything) is likely to bring relief.

The Current State of Diesel Prices (September 2026)

According to EIA's weekly Gasoline and Diesel Fuel Update, national average on-highway diesel prices have climbed sharply since the summer of 2026:

• Week of September 14, 2026: $6.285 per gallon — an all-time high in the EIA's weekly series.
• September 7, 2026: $5.967 per gallon, itself a jump of 36.8 cents in a single week and a level that had already exceeded the prior record set in June 2022.
• August 31, 2026: $5.599 per gallon nationally, with California alone averaging $7.218 per gallon.
• 2022 record annual average: $4.989 per gallon — the benchmark diesel is now on pace to break for the full year.

Diesel's year-to-date average through the first week of September 2026 works out to roughly $4.895 per gallon. Analysts calculating from EIA's weekly data note that if prices simply held at the September 7 level through the rest of the year, the 2026 annual average would land around $5.22 per gallon — comfortably above the 2022 record. Gasoline, by contrast, remains well below its own 2022 peak of $5.006 per gallon, which is part of why diesel's surge has drawn less everyday public attention even though it's arguably a bigger economic story.

Regionally, prices vary enormously. The West Coast (PADD 5), which includes California, has consistently been the most expensive region — running around $7.25 per gallon in mid-September 2026 — because it is largely isolated from other U.S. refining hubs and California mandates its own cleaner-burning fuel blend on top of some of the highest state fuel taxes in the country. The Gulf Coast (PADD 3), home to the densest concentration of U.S. refining capacity, has the cheapest diesel, around $6.03 per gallon in the same week — still a gap of over $1.20 between the two regions.

You can track these numbers yourself directly from the source: EIA's weekly diesel price data is published every Monday (with results released Tuesday afternoons) at eia.gov/petroleum/gasdiesel.

Why Diesel Usually Costs More Than Gasoline Anyway

Before getting into what's driving 2026's spike specifically, it helps to understand why diesel tends to run more expensive than gasoline even in "normal" years. Several structural factors are always at play:

1. Higher federal and state taxes. The federal excise tax on diesel is 24.4 cents per gallon, compared with 18.4 cents per gallon for gasoline. Many states layer additional diesel-specific taxes on top, since diesel is treated as a commercial/heavy-vehicle fuel.

2. Refining complexity. Diesel (technically "distillate fuel oil," which also includes heating oil) requires additional refining steps to meet clean-fuel standards, particularly Ultra-Low Sulfur Diesel (ULSD) requirements that have been in place since the mid-2000s.

3. Global demand competition. Diesel is used worldwide not just for transportation but for home heating, backup power generation, agriculture, shipping, and industrial equipment. That gives it a broader, more geopolitically sensitive demand base than gasoline, which is used almost exclusively for passenger vehicles.

4. Export dynamics. The U.S. is a major diesel exporter. When global diesel is scarce, American refiners can often get a better price selling it abroad than domestically, which pulls supply — and pushes prices — higher at home.

According to EIA's own breakdown of "what goes into diesel prices," the retail price is a function of four main components: the price of crude oil, refining margins (the "crack spread"), distribution and marketing costs, and taxes. In a normal year, crude oil accounts for roughly half of what you pay at the pump. In 2026, it's the second component — refining margins — that has moved the most.

The Real Reasons Diesel Prices Spiked in 2026

Multiple forces have converged simultaneously in 2026, which is part of why the price move has been so severe. Here's a breakdown of each one.

1. A Historically Wide Refining Margin ("Crack Spread")

EIA calculates the diesel "crack spread" by subtracting the spot price of crude oil from the wholesale price of diesel — essentially, the profit margin refiners earn turning crude into finished diesel. That spread widened dramatically through late 2025 and into 2026. In New York Harbor, the U.S. Gulf Coast, and Europe's ARA hub, crack spreads pushed above $1 per gallon in the fall of 2025 for the first time in more than a year, and refining margins in some markets hit roughly $29 a barrel by October 2025 — the highest level since February 2024. By early September 2026, EIA explicitly cited the combination of a high crack spread and an elevated price of crude oil as the twin forces pushing retail diesel prices upward.

In plain terms: refiners are paying more for crude, but they're also charging significantly more to turn that crude into diesel, because global demand for finished diesel is outrunning the world's refining capacity to produce it.

2. Extremely Tight Global Distillate Supply

This is arguably the single biggest factor. EIA's Short-Term Energy Outlook forecasts that U.S. distillate inventories will fall below 100 million barrels in September 2026 and remain below the five-year (2021–2025) range through the end of 2026 and most of 2027. Inventories first dropped below that historical range back in April 2026, coinciding with a surge in U.S. diesel exports after major supply losses from the Middle East, Russia, and China hit international markets.

Globally, distillate production has been curtailed by reduced refining activity in three key regions at once: Russia, China, and parts of the Middle East. That triple squeeze has driven up the cost of importing diesel into the U.S. while simultaneously increasing foreign demand for the diesel the U.S. does produce — a lose-lose combination for American consumers, even as U.S. refiners run flat-out.

3. Ukraine's Drone Campaign Against Russian Refineries

Since Russia's full-scale invasion of Ukraine, Ukraine has increasingly targeted Russian oil refining infrastructure with long-range drone strikes, and that campaign intensified sharply through 2026. The International Energy Agency has estimated that a Russian refinery was successfully struck by a drone roughly once every three days during the first eight months of 2026. Individual refinery complexes have seen catastrophic drops in output — trading-exchange data reviewed by independent Russian outlet Meduza showed fuel sales from the Moscow refinery's delivery points falling from about 4,400 tonnes per day to roughly 400 tonnes after mid-June strikes, while the Kirishi refinery lost about 80% of its sales following a May attack, and other major refineries (Samara, Norsi, Taneco) lost between roughly 55% and 65% of their output.

Russia is normally the world's second-largest diesel exporter, and the loss of that capacity — combined with Moscow's own decision to restrict fuel exports to protect domestic supply — has pulled a significant volume of diesel out of the global market. Russian diesel exports reportedly fell below 1 million metric tons in June 2026, down from roughly 2.5 million tons a year earlier, according to trader estimates cited by Reuters.

4. Western Sanctions on Russian Oil Companies

Layered on top of the physical refinery damage, Western governments escalated sanctions on Russia's oil sector through late 2025 and into 2026. The U.S. and U.K. sanctioned Russia's two largest oil companies, Rosneft and Lukoil, in October 2025 — a first for direct U.S. sanctions on Russian oil majors since the war began. That followed an EU decision, also in October 2025, to tighten restrictions further on Rosneft, Lukoil, and Gazprom Neft, building on an EU ban (effective from July 2025, with a further import ban on refined products from Russian crude taking effect in January 2026) targeting fuel refined from Russian crude even when it's processed in third countries like India and Türkiye — a move explicitly designed to close a loophole that had let refiners in those countries import discounted Russian crude, refine it, and re-export the diesel to Europe.

Additional sanctions in January 2026 targeted Gazprom Neft and Surgutneftegas along with roughly 183 vessels tied to Russia's "shadow fleet" of tankers, putting at least 150,000 barrels per day of Russian diesel exports at risk, according to consultancy Energy Aspects. Each new sanctions round has forced global fuel traders to scramble for alternative, non-Russian supply — and every scramble has pushed prices and refining margins higher, at least temporarily.

5. Middle East Refinery Disruptions

It isn't just Russia. An extended outage at Kuwait's massive Al Zour refinery, one of the newest and largest in the Middle East, has persisted since late October 2025, further tightening global refined product supply. Saudi Arabia has separately dealt with operational problems at its Ras Tanura refinery, forcing the kingdom — normally an exporter — to import diesel, including cargoes from Russia, just to meet domestic demand. Broader instability tied to Middle East conflicts has added another layer of uncertainty to global refined-fuel flows throughout 2026.

6. U.S. Refiners Are Already Running Flat Out

It's not for lack of trying that American refiners haven't closed the gap. U.S. distillate production between January and August 2026 averaged 5.1 million barrels per day — the highest since 2019 — and refinery utilization nationally hit 97% for the week ending September 11, 2026, according to EIA's Weekly Petroleum Status Report. That's about as close to full capacity as the U.S. refining system gets. Because global buyers are willing to pay a premium for diesel, U.S. net exports of distillate fuel have stayed at or above the 2021–2025 five-year high since February 2026 — meaning much of that near-record domestic production is heading overseas rather than easing prices at home.

7. Seasonal Demand

Diesel demand typically climbs each fall as the agricultural harvest ramps up (tractors, combines, and grain trucks all run on diesel) and again into winter as demand for heating oil — chemically similar to diesel — increases in the Northeast. That seasonal uptick was already layered on top of the supply disruptions described above, adding further upward pressure in September 2026.

Political Response

The price surge hasn't gone unnoticed in Washington. In early September 2026, President Trump met privately with major refiners and fuel distributors to discuss ways to boost domestic output and ease consumer prices, reportedly covering potential regulatory changes and faster permitting for refinery projects. No firm commitments were announced immediately, but the meeting reflects how politically sensitive diesel and gasoline prices have become heading into the 2026 midterm elections. Some analysts, however, have cautioned that this price spike — much like similar sanctions-driven spikes in 2022 and early 2026 — may prove relatively short-lived if Russian diesel simply gets rerouted and rebranded through intermediary markets, as has happened after previous sanctions rounds, or if global refiners shift their crude slates to maximize diesel output in response to the wider margins.

For the latest official U.S. government commentary on energy markets, EIA's Short-Term Energy Outlook is updated monthly and free to the public at eia.gov/outlooks/steo.

What This Means for Everyday Drivers

Most American passenger vehicles run on gasoline, so relatively few individual drivers are paying diesel prices directly at the pump. But diesel ownership is far from rare — heavy-duty pickup trucks (Ford Super Duty, Ram 2500/3500, Chevrolet Silverado HD), many SUVs used for towing, and a meaningful share of used and newer passenger diesel vehicles are still on the road. For these owners, the math has changed substantially: a diesel truck with a 35-gallon tank now costs roughly $220 to fill at the national average, versus around $145 for a comparable gasoline truck — a gap of about $75 per fill-up that adds up fast for anyone who drives for work, tows regularly, or covers long distances.

Diesel owners can take a few practical steps:

• Compare prices before filling up using apps like GasBuddy, which track diesel prices station by station, since the spread between the cheapest and most expensive stations in a given area can be 30–50 cents per gallon.
• Avoid unnecessary idling, which burns diesel fuel without producing any distance traveled — a bigger cost issue than with gasoline engines given diesel's premium price.
• Keep up with maintenance, since a poorly maintained diesel engine (clogged filters, underinflated tires, old glow plugs) loses fuel efficiency disproportionately.
• Consider fuel-card or loyalty programs, many of which offer per-gallon discounts at truck stops and major chains for regular diesel buyers.

What This Means for Businesses

This is where the diesel price story really matters economically, because diesel touches nearly every supply chain in the country.

Trucking and Logistics

Diesel is typically a trucking company's second-largest operating cost after labor, often representing 20–25% of total operating expenses for over-the-road carriers. Most freight contracts include a fuel surcharge (FSC) — a variable add-on tied to the current average diesel price, usually benchmarked against EIA's weekly national average — that's designed to pass rising fuel costs through to shippers rather than absorbing them entirely. Fleet managers and owner-operators should:

• Confirm their fuel surcharge formula is indexed to a current, transparent benchmark (most commonly EIA's weekly on-highway diesel average).
• Recalculate surcharges weekly rather than monthly during periods of rapid price movement, since a stale surcharge can mean absorbing losses on every load.
• Explore fuel hedging or fixed-price fuel contracts with a fuel supplier if diesel volatility is squeezing margins on fixed-rate freight contracts.
• Evaluate route and idle-time efficiency software, which can meaningfully cut fuel consumption across a fleet.

Agriculture

Diesel powers tractors, combines, irrigation pumps, and grain trucks, and the price spike is landing squarely during the fall 2026 harvest season, when diesel demand and prices both typically peak. Farmers operating on already-thin margins may want to look at forward-purchasing diesel or locking in bulk fuel contracts with local co-ops ahead of the heaviest usage periods, and to time non-essential diesel-powered fieldwork around price dips where feasible.

Construction and Heavy Equipment

Excavators, bulldozers, generators, and most heavy machinery run on diesel. Contractors bidding on new projects in late 2026 should build higher fuel-cost assumptions into estimates and consider fuel-price escalation clauses in longer-term contracts to avoid getting locked into a bid that no longer reflects current fuel costs.

Retail, Manufacturing, and Consumer Prices

Because nearly all goods in the U.S. move by truck, rail, or ship at some point — all of which rely heavily on diesel — sustained high diesel prices tend to show up a few months later as higher shipping surcharges, which retailers and manufacturers often pass on to consumers. Economists watch diesel prices closely as a leading indicator of "cost-push" inflation pressure precisely because of this delayed pass-through effect. Businesses that ship goods regularly should expect and budget for freight-cost increases through the remainder of 2026 if diesel prices stay elevated.

Diesel Price Outlook: Will Prices Come Down?

There's no consensus forecast, but a few signals are worth watching:

• EIA's Short-Term Energy Outlook currently projects distillate inventories staying below their five-year range through most of 2027, suggesting the underlying tightness isn't expected to resolve quickly.
• Refining margin forecasts: Some analysts, including Goldman Sachs, have projected elevated refining margins persisting through 2027, pointing to a structurally tighter diesel market rather than a temporary blip.
• Sanctions "rerouting" history: Past rounds of Russia-related sanctions (2022–2023, and earlier 2025 rounds) initially spiked diesel prices before markets adjusted as Russian barrels found their way to non-sanctioning buyers through intermediaries — a pattern some analysts expect to partially repeat, which could ease prices somewhat even without a resolution to the underlying conflict.
• Seasonal factors: Diesel demand typically eases somewhat after the fall harvest concludes, though winter heating-oil demand in the Northeast can offset that in colder months.
• U.S. refinery capacity: With U.S. refineries already running near 97% utilization, there's limited room for U.S. producers to meaningfully increase output without new capacity coming online, which takes years, not months.

For real-time tracking, EIA's Gasoline and Diesel Fuel Update publishes new figures every Monday/Tuesday at eia.gov/petroleum/gasdiesel, and its Today in Energy section (updated with in-brief analysis, most recently September 18, 2026) is a good source for plain-language explanations of what's moving prices at eia.gov/todayinenergy.

Frequently Asked Questions

Why is diesel more expensive than gasoline right now?

Diesel is facing its own supply crunch on top of general oil-market pressures: refining margins for diesel have widened sharply, global distillate inventories are historically tight, and major disruptions to Russian and Middle Eastern refining capacity have pulled significant volumes of diesel off the world market. Gasoline hasn't faced the same combination of pressures, so the price gap between the two fuels has widened well beyond its historical norm.

What is the current average diesel price in the U.S.?

As of the week of September 14, 2026, EIA's weekly survey put the U.S. national average for on-highway diesel at $6.285 per gallon — an all-time high. Prices vary by region, with the West Coast running highest (around $7.25/gallon) and the Gulf Coast lowest (around $6.03/gallon).

Is diesel more expensive in California than the rest of the country?

Yes, consistently. California and the broader West Coast region are largely cut off from the rest of the U.S. refining and pipeline network, must use a state-mandated cleaner-burning fuel blend, and carry some of the highest state fuel taxes in the country. California diesel averaged around $7.22 per gallon in late August 2026, well above the national average.

Why is Russia's war in Ukraine affecting U.S. diesel prices?

Russia is normally the world's second-largest diesel exporter. Ukrainian drone strikes have knocked out a significant share of Russia's refining capacity throughout 2026, and Western sanctions have further restricted where Russian diesel can be sold. Because diesel trades in a global market, the loss of Russian export volumes tightens supply and raises prices everywhere, including in the U.S., even though the U.S. imports relatively little Russian fuel directly.

Are diesel prices expected to break the annual record set in 2022?

It's likely, based on current data. The 2022 nominal annual average record was $4.989 per gallon. With diesel already averaging around $4.895 per gallon year-to-date through early September 2026 — before the latest jump to over $6 — most analysts calculating from EIA data expect 2026 to finish with a new record annual average unless prices fall substantially before year-end.

How does the fuel surcharge on my shipping or freight invoice work?

Most freight contracts include a fuel surcharge (FSC) that adjusts automatically based on a published diesel price benchmark, most commonly EIA's national weekly average. As diesel prices rise, the surcharge — and therefore the total shipping cost — rises with it, without renegotiating the base freight rate. Businesses should confirm which benchmark and update frequency their carrier or shipper contract uses.

Will high diesel prices make groceries and other goods more expensive?

Likely, with a delay. Because nearly all consumer goods move by truck, rail, or ship at some point, and those modes overwhelmingly run on diesel, sustained increases in diesel costs tend to show up in retail prices a few months later as shipping and freight surcharges get passed through the supply chain.

What is the diesel "crack spread" and why does it matter?

The crack spread is the difference between the wholesale price of diesel and the price of the crude oil used to make it — essentially, the refiner's profit margin. When global diesel supply is tight relative to demand, refiners can charge much more for the same barrel of crude, and that margin gets passed to consumers at the pump. Crack spreads pushed above $1 per gallon in several key markets in late 2025, a level not seen in over a year, and have remained elevated into 2026.

Are U.S. refineries producing less diesel because of the price spike?

No — the opposite. U.S. refineries have been running at nearly full capacity (97% utilization as of mid-September 2026) and distillate production has been at its highest level since 2019. The problem isn't lack of U.S. production; it's that global demand for diesel — driven by shortages elsewhere — is pulling a record share of that production into exports rather than the domestic market.

What can trucking companies and small businesses do to manage high diesel costs?

Common strategies include indexing fuel surcharges to a current, transparent benchmark like EIA's weekly diesel average; locking in bulk fuel purchase agreements or hedges where available; improving route planning and reducing idle time to cut fuel consumption; and, for longer-term contracts, negotiating fuel-price escalation clauses so unexpected spikes don't erode already-thin margins.

Sources and Further Reading

• U.S. Energy Information Administration, Gasoline and Diesel Fuel Update: https://www.eia.gov/petroleum/gasdiesel/
• EIA, "What goes into diesel prices?" (Today in Energy, September 18, 2026): https://www.eia.gov/todayinenergy/detail.php?id=68164
• EIA, Short-Term Energy Outlook: https://www.eia.gov/outlooks/steo/
• EIA, "Geopolitical developments contribute to elevated diesel prices": https://www.eia.gov/todayinenergy/index.php?tg=+diesel
• OilPrice.com, "U.S. Diesel Prices on Track for Record Year": https://oilprice.com/Energy/Energy-General/US-Diesel-Prices-on-Track-for-Record-Year.html
• OilPrice.com, "Drone Strikes Cripple Half of Russia's Top Diesel Refineries": https://oilprice.com/Latest-Energy-News/World-News/Drone-Strikes-Cripple-Half-of-Russias-Top-Diesel-Refineries.html
• Baird Maritime, "Diesel price spike from Russia sanctions may be short-lived": https://www.bairdmaritime.com/offshore/refining-processing/opinion-diesel-price-spike-from-russia-sanctions-may-be-short-lived
• ROIC.ai, "US diesel prices near April peak as refining crisis bites": https://www.roic.ai/news/us-diesel-prices-near-april-peak-as-refining-crisis-bites-09-02-2026
• Weekly Diesel, U.S. national and regional diesel price tracker: https://weeklydiesel.com/region/us/

Diesel and fuel prices change weekly and can shift quickly with global events. Figures in this article reflect EIA and market data available as of September 21, 2026; check the linked sources above for the latest updates.