Diesel Hits a Record as Gasoline Climbs: What Minnesota’s Fuel Prices Show

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NLP News · Energy and household costs · By Matt Stoltz

Price snapshot: September 21, 2026. These are dated averages, not live station quotes.

Gasoline is getting more expensive, and diesel is moving faster. On September 21, AAA reported a national regular-gasoline average of $4.479 per gallon and a diesel average of $6.511. Diesel was at the highest nominal average in AAA’s record. Regular gasoline remained below its June 2022 nominal peak of $5.0165. “Nominal” means the dollars recorded at the time, without adjusting earlier prices for inflation. AAA national prices.

The distinction matters in Minnesota. A household sees gasoline when it fills the car. Diesel also enters the cost of moving goods and running equipment. That gives a diesel spike a route into household expenses even when the family vehicle never uses it. The size and timing of any price increase on store shelves still depend on businesses’ contracts, margins and other costs; a fuel increase does not translate into an identical percentage increase in groceries. ABC News, September 18.

The September 21 numbers

All amounts below are U.S. dollars per U.S. gallon at retail, including applicable fuel taxes. Gasoline means regular unleaded, not premium or the average of all grades. Diesel means road-use retail fuel; these are not farm-delivery or tax-exempt off-road quotes. Figures are rounded from the source’s four decimal places, and changes are calculated from the unrounded values.

• United States: regular gasoline $4.479, up 16.23 cents from a week earlier; diesel $6.511, up 28.06 cents. Compared with AAA’s year-ago readings, regular was about $1.30 higher and diesel about $2.81 higher. AAA national table.
• Minnesota: regular gasoline $4.390, up 16.46 cents in a week; diesel $6.328, up 25.31 cents. Minnesota diesel was also at a nominal record in AAA’s series. AAA Minnesota table.
• Mankato, for nearby regional context: regular gasoline $4.414 and diesel $6.368. Those are AAA’s Mankato averages. They are not Waseca prices and do not establish what any particular station charges. AAA metro readings.

Using the Minnesota regular average, a hypothetical 15-gallon purchase costs $65.85, about $2.47 more than a week earlier. A hypothetical 100-gallon road-diesel purchase at the Minnesota average costs $632.81, about $25.31 more. Those are simple illustrations, not estimates of any named household’s or business’s bill.

AAA’s figures are pump-price averages, rather than untaxed wholesale quotations. Its data partner, OPIS, explains that retail fuel costs incorporate wholesale fuel, taxes, transportation and the retailer’s margin. Tax treatment and delivery terms are reasons a farmer’s bulk invoice can differ from a highway pump. OPIS retail-market explanation, page 18.

Why another credible report may show a different price

AAA updates daily using OPIS data. The federal Energy Information Administration publishes a separate weekly survey. Their sampling and timing differ, so their numbers should not be spliced into one supposedly continuous daily trend. AAA methodology overview · EIA gasoline methodology.

The latest EIA retail release available for this article was published September 15, describing prices observed September 14. It showed U.S. regular gasoline at $4.319, Minnesota regular at $4.223, U.S. on-highway diesel at $6.285, and Midwest diesel at $6.250. The Midwest figure covers a multistate region; it is not a Minnesota diesel estimate. All include taxes. EIA weekly fuel update.

EIA’s current schedule says these prices normally come out around 10 a.m. Eastern on Tuesday, representing Monday’s observations. Its next listed release was September 22. That September 14 observation is useful as a weekly benchmark, but calling it “today’s price” on September 21 would be wrong. EIA release schedule.

For diesel, EIA surveys cash self-service prices for on-highway ultra-low-sulfur diesel at service stations and truck stops in the contiguous United States. Its estimates are weighted by sales volume. A posted credit-card price or a negotiated fleet price need not match that benchmark. EIA diesel methodology.

The war matters, but crude oil is only part of the bill

Reuters reported September 21 that the wars in Iran and Ukraine had curtailed diesel supplies from major exporting regions. Its reporting described refinery damage, restrictions on Russian exports, and disruptions extending into Red Sea routes used by Saudi Arabia. This is evidence of a broad supply problem, rather than a claim that one distant event explains every cent at a Minnesota station. Reuters, republished by AOL.

EIA’s September outlook likewise connected tight global distillate supplies with stronger demand for U.S. exports and low domestic inventories. Distillates include diesel and heating oil. The agency warned that autumn refinery maintenance and harvest demand could put additional pressure on supply. Its forecast anticipated inventories below their recent five-year seasonal range through much of 2027. EIA September outlook, pages 3 and 6–7.

That forecast was released September 9, using model inputs finalized September 3. Its projected improvement depended partly on recovering oil and product flows from the Middle East. It is a conditional outlook, not a promise of lower pump prices on a particular date—and it does not incorporate every development since September 3. EIA forecast timing and assumptions.

Gasoline has its own seasonal pattern. Driving demand generally eases after summer, and winter gasoline specifications can lower production costs. But a refinery outage, a pipeline problem or higher crude costs can outweigh that seasonal relief. EIA identifies supply, inventories, refining and seasonal specifications as separate influences. EIA gasoline price fluctuations.

Local competition, distribution costs and station operating expenses matter too. The pump is the end of a supply chain, not a direct display of today’s crude-oil futures price. EIA also notes a typical lag between wholesale price changes and retail changes. That makes “oil fell this morning, so gasoline must fall tonight” an unreliable prediction. EIA retail-cost factors · EIA pump-price methodology.

What this establishes for Waseca

The national and state data establish substantial pressure on fuel budgets. They do not establish a current Waseca station price, a local fuel shortage, a particular retailer’s profit, or a specific upcoming increase in food prices. This report has not independently checked individual Waseca pumps or obtained local supplier invoices.

For an ordinary comparison, keep the product, date and payment terms together: regular versus premium; road diesel versus off-road delivery; cash versus credit; advertised price versus a loyalty discount. A receipt from one station and a statewide average answer different questions. Both can be accurate.

The next useful checks are concrete: AAA’s next dated Minnesota reading, EIA’s September 22 release, and whether actual fuel production and shipping recover. A diplomatic announcement may change expectations quickly. Rebuilding inventories and delivering replacement fuel take physical supply. Neither an optimistic headline nor a frightening social post substitutes for those measurements.

Reporting note: Sources were checked September 21, 2026. Price comparisons use each provider’s own series. Calculations use unrounded AAA values. No local-station survey or interviews are represented in this report.