US Fuel Prices This Week: What Moved and Why It Matters

This week's headline: prices keep climbing

The national numbers tell a blunt story. US diesel hit a 2026 high of $6.48 a gallon, observed September 22, 2026, and held there at $6.48 as of September 23, 2026. Gasoline followed the same path, touching its 2026 high of $4.48 on September 23, 2026, the same day it was last recorded at that level. Compare either figure to where the year started. Diesel averaged $3.52 in January 2026, so the move to $6.48 represents an 84 percent climb from that January base to both the 2026 high and the latest reading. Gasoline averaged $2.70 in January 2026, putting its rise to $4.48 at 66 percent from that same starting point.

Those are not small percentage moves. For any fleet running on fixed routes, fixed bids, or thin margins, an 84 percent swing in diesel since January is the difference between a profitable quarter and a scramble to renegotiate contracts. This week's data confirms that the climb has not leveled off. It has simply kept going.

What's driving the market

A handful of stories from the past few days explain why prices have been so restless.

CNBC Energy reported Thursday, September 24, 2026, that oil fell after a report showed Asia is on track to import its highest volume of crude since the start of the US-Iran conflict. More Asian buying usually points to tighter global supply, so the sell-off suggests traders are still digesting what that demand pattern means for prices heading into the rest of the year.

At the same time, WSJ Markets noted in its September 2026 coverage that the Singapore dollar was consolidating against the US dollar, with geopolitical tension staying elevated after Iran issued a warning concerning the Strait of Hormuz. Currency markets rarely move on fuel-specific news alone, and when they do react to a strait that handles a large share of the world's oil shipments, it is worth paying attention.

Separately, WSJ Markets reported this week that oil prices fell after a larger-than-expected build in US crude oil inventories. A bigger stockpile than analysts expected usually signals softer near-term demand or stronger supply, and that combination pulled prices back from earlier gains. It is a reminder that even in a tight market, a single inventory report can move the needle for a day or two.

On the policy side, Politico Energy reported this week that the White House is preparing a plan for a 90-day ban on diesel exports, according to sources close to the discussions. FT Companies reported around the same time that US oil industry groups are pushing back, arguing there is no single fix for the fuel price situation and that an export ban could create new problems even as it tries to solve old ones. If the ban moves forward, US diesel buyers could see the domestic supply picture shift quickly, for better or worse, depending on how refiners and shippers respond.

There was also a more corporate story in the mix. FT Companies reported this week that Pioneer Natural Resources founder Scott Sheffield has accused ExxonMobil and regulators of orchestrating a smear campaign to block him from an Exxon board seat, tied to allegations of Opec collusion. It is not a story that moves pump prices directly, but it is a sign of how much scrutiny the oil industry is under right now, from regulators, shareholders, and the public alike.

State by state: who is paying the most

National averages hide a lot of variation, and this week's numbers show just how wide the gap between states has become.

California remains in a league of its own. Diesel there hit $8.44 a gallon, its 2026 high, observed September 22, 2026, and was still at that level on September 23, 2026. That is 81 percent above the state's January 2026 average, a gap that applies to both the 2026 high and the latest reading. California gasoline told a similar story, reaching its 2026 high of $6.20 a gallon on September 23, 2026, a level 55 percent above where the state's gasoline average stood back in January 2026.

Hawaii and Alaska are not far behind in absolute terms, even if their year-over-year comparisons are not tracked the same way. Hawaii diesel sat at $7.16 a gallon on September 23, 2026, matching its 2026 high set the same day. Alaska diesel came in at $6.66 on September 23, 2026, just under its 2026 high of $6.67 observed two days earlier, while Alaska gasoline was at $5.06, well below its 2026 high of $5.25 set back on May 27, 2026.

Colorado offers a useful contrast. The state's gasoline sat at $4.35 a gallon on September 23, 2026, and its 2026 high of $4.60 was observed on May 18, 2026, a level 100 percent above the state's gasoline average from January 2026. That is one of the steepest year-to-date climbs in the country, even though Colorado's current gasoline price is not the highest in absolute dollar terms.

At the other end, Gulf Coast states continue to run cheaper than the coasts. Gulf Coast diesel was $6.18 a gallon as of September 21, 2026, still 91 percent above its January 2026 average of $3.23, and Gulf Coast gasoline sat at $4.00, up 66 percent from its January 2026 base of $2.41. Florida diesel came in lower still, at $6.23 on September 23, 2026, while Florida gasoline was $4.29, a 58 percent rise from its January 2026 average of $2.71.

The pattern across nearly every state is the same direction, just different steepness. Nowhere in this data set is diesel or gasoline sitting near where it started the year.

What this means for fuel buyers

When national diesel is up 84 percent and gasoline up 66 percent since January, the risk for any business running trucks, buses, or delivery vehicles is not hypothetical. It is showing up in fuel invoices right now. A contractor who priced a job in January using that month's fuel numbers is very likely underwater on fuel costs today, unless the contract had some built-in flexibility.

This is exactly the situation we cover in Budgeting Fuel for a Fixed-Bid Contract Season: A Guide, and it applies just as directly to operators managing school routes and shuttle contracts, a topic we walk through in Fuel Cost Management for School and Shuttle Transport Contractors. Equipment rental companies with delivery fleets face the same exposure, which is why we also wrote Fuel Strategy for Equipment Rental Companies with Delivery Fleets.

The common thread across all three is timing. Businesses that locked in a maximum price before this week's climb are simply not affected by it. Businesses still buying fuel at the pump, at whatever the local station charges, are absorbing every dollar of the move described above.

Locking in certainty with FuelAnchor

FuelAnchor's fixed-price fuel supply agreements set a locked maximum price per gallon or litre, so a week like this one does not change what you pay. If you are weighing whether a fuel card program or a price cap agreement fits your operation better, our comparison at /fuel-card-vs-fuel-cap breaks down the differences plainly.

Next step

If your fleet's fuel costs are still tracking the open market, this is a reasonable week to price out a fixed-price agreement before the next inventory report or policy announcement moves prices again. Start with a quick quote at /#quote and see what a locked maximum price would mean for your next quarter's fuel budget.