$5+ Diesel Could Unleash Inflationary Mindset the Fed Better Not “Look Through.” Inflation Was already Hot before Iran War

When this inflationary mindset takes off, inflation becomes like a runaway train.

By Wolf Richter for WOLF STREET.

The problem is that even before fuel prices began to spike, inflation had already been accelerating and running hot, and the current fuel price spikes will add to it, just when the economy has become more forgiving of price increases. That’s very bad timing:

The broadest inflation gauge, which tracks inflation across GDP and not just consumer-facing inflation, rose by 3.7% in Q4. The price index in GDP that excludes imports rose by 3.8% in Q4, the worst since 2022. The core PCE Price Index, the Fed-preferred inflation index for consumer price inflation, rose by 3.1% in January, the worst in nearly two years. The core Producer Price Index, which tracks inflation that companies face, jumped by 5.6%, the worst since August 2022 (see charts at the bottom of the article).

The average retail price of gasoline, all grades combined, at gas stations on Monday spiked by another $0.24 from the prior week, and by $1.17 or by 40% since the beginning of the year, to $4.10 per gallon, the highest since August 2022, according to EIA data released this morning, based on a survey of gas stations on Monday.

These price increases of gasoline will enter into the inflation calculations for the Consumer Price Index (CPI) and the Fed-preferred PCE price index for March, to be released in April; and they will push up the broad GDP inflation measures for Q1.

The three-and-a-half-year long decline in gasoline prices from over $5 in mid-2022 to $2.91 in early January was a substantial contributor to the cooling of overall consumer price inflation rates. And that impetus has done a U-turn. Overall inflation measures for March will show that U-turn, and will be hot.

But gasoline price spikes unwind: In early January 2026, gasoline cost the same as during some periods in 2007 and 2008, and a lot less than during part of the time in between.

When gasoline prices fall back to earth, they push down inflation, which is why the Fed could be tempted to “look through” (meaning, ignore) the spike of gasoline prices.

But diesel is a serious problem for core inflation. The price of highway diesel on Monday spiked by another $0.30 from the prior week, and by $1.90 or 55% from the beginning of the year, to $5.37 per gallon. Year-over-year, the price of diesel jumped by 51%!

Only a small portion of consumers drive vehicles with diesel engines – some pickups and SUVs, and some older European imports.

But diesel prices feed into transportation costs, and they feed into costs of goods and transportation services that companies pay for, and they will try to pass those costs on via higher prices of goods and services that eventually filter through to the end-users, including consumers. And those prices of goods and services are part of core inflation measures.

The daily spot price of jet fuel has doubled since early January. Airlines are aggressively trying to pass those cost increases – a substantial part of their overall costs – on to their ticket prices, and if people continue flying, rather than forgoing trips that are suddenly a lot more expensive, those price increases could stick.

Many airlines hedge part of their fuel purchases, so their cost increases don’t exactly track the spike of the spot price of jet fuel.

Airline fares are part of services inflation and are part of the core inflation measures. Thankfully for consumers, airlines have a history of being forced to eat higher fuel prices and book losses as they could not raise fares without losing a lot of business. But they’re trying.

Air freight also faces higher fuel costs, and that impacts all kinds of transportation costs that could filter into prices of goods and services.

Ocean shipping and transportation by rail also face higher fuel prices. And carriers will also try to pass on those costs, and all this is additive.

Fuel price spikes could trigger the inflationary mindset, when consumers are willing to pay those higher prices, and demand higher wages, and companies are willing to pay those higher wages to their workers and higher prices for goods and services they need, knowing that they can pass on those costs plus some to the next entity, and ultimately plus-some to consumers, which is what happened in 2021 and 2022, amid a historic spike in profits, and in the 1970s. When this inflationary mindset takes off, inflation becomes like a runaway train.

The Fed can deal with this by hiking its short-term policy rates to whack the inflationary mindset out of the minds of businesses and consumers. It doesn’t always work and it can get messy, but that’s the main tool the Fed has when the inflationary mindset takes off. Alternatively, it could try to prevent the inflationary mindset from even taking off by responding quickly with rate hikes – something it failed to do when that inflationary mindset began taking off at the end of 2020, and the Fed didn’t initiate the first feeble rate hike until March 2022.

Current inflation gauges, which still predate Iran war, were already hot:

Inflation as tracked across the economy in GDP, except imports, in Q4: +3.8% annual rate.

Core inflation that consumers face, which excludes energy and food, as tracked by the Fed-favored Core PCE price index: +3.1% year-over-year (red), worst in nearly two years. The Fed’s target for this measure is 2.0%.

Core inflation that businesses face, as tracked by the Core PPI Final Demand: +5.6% six-month average annualized (red), the worst since August 2022.

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  45 comments for “$5+ Diesel Could Unleash Inflationary Mindset the Fed Better Not “Look Through.” Inflation Was already Hot before Iran War

  1. Matt says:

    Well, the Fed continues to look through inflation just like they look through main street.

  2. All Good Here Mate says:

    Insane. According to our AI Friends, “Diesel is generally cheaper to produce than gasoline because it requires less refining. However, various factors such as taxes, demand, and environmental regulations can lead to diesel being more expensive at the pump.”

    I can think of two of those that can be solved rather easily. I have now cured this round of inflation and nominate Wolf as next Fed Chair and all the commenters as Board Members.

    • Ray Charles' Tennis Coach says:

      My first Executive Action as a Board Member is mandating that hotdog buns and hot dog packs are sold in the same quantity.

      Thank you for your attention to this matter.

    • Candyman says:

      Hear! Hear!

    • Wolf Richter says:

      That’s somewhat nonsensical AI slop. A refinery gets fewer gallons of diesel out of a barrel of oil than gasoline, and diesel is a denser fuel, containing more energy per gallon than gasoline. Gasoline blended with alcohol is even less dense.

      A refiner can get only about 12 gallons of diesel (ultra-low sulfur distillate) out of a barrel of WTI; or it can get about 20 gallons of gasoline out of a barrel of WTI.

      In other words, to produce 100,000 gallons of diesel, a refinery needs a lot more crude oil than it needs to produce 100,000 gallons of gasoline. Refiners juggle this around, along with all the other products they produce from a barrel of crude oil, to maximize their profits.

      (just in case: 1 barrel = 42 gallons)

      • All Good Here Mate says:

        See, that’s why you’re our new Chair! Thanks for the extra information.

        • Simple Midwest Guy says:

          I second the motion to make Wolf the next Fed Chair.

          Now for all who approve say “I”

      • Cory R says:

        So the move to ULSD is the reason it flipped to more expensive than gas?

      • uukj says:

        From Bloomberg cited on Adam Tooze’s blog today:

        “Oil refineries are complex machines capable of processing multiple streams of crude into dozens of petroleum products. For simplicity’s sake, the industry measures refining margins using a rough calculation called the “3-2-1 crack spread”: For every three barrels of WTI crude the refinery processes, it makes two barrels of gasoline and one barrel of distillate fuel such as diesel or jet fuel.”

  3. SoCalBeachDude says:

    MW: Dow, S&P and Nasdaq end lower, oil prices and Treasury yields climb as worries over Iran war persist

    DJIA -0.18% SPX -0.37% COMP -0.84% CL.1 +4.28%

  4. WIRE Associates says:

    In Newport Beach, CA this morning saw a gallon of diesel at $7.57. Seems sustainable, right?

    • Dan says:

      Only in newport beach do they shrug their $houlders and whip out the plastic. Everything there is perpetually price bloated. I get your point though. Moving inland, those prices began to shut people out of the food market.

    • Don says:

      In Brookings Oregon it’s now 5.89 a day after I filled up for 5.45.

    • Matt B says:

      CA diesel has officially hit $7 according to GasBuddy.

  5. spencer says:

    The price elasticity of demand will offset an increase in the inelastic demand for fuel. There’s an absolute historic rise in the demand for money, decreasing the velocity of circulation.

    • Gaston says:

      My ability to understand this comment decreased as the increase of my ignorance decreased my desire for knowledge on the increased assumption that this information would becoming decreasingly valuable to me

      • Simple Midwest Guy says:

        I think your elasticity needs to increase then so inelasticity can decrease so that you can reach an equilibrium of being both flexible and inflexible to deal with the modern paradigm of paradox that seem to exist in the ethereal ethos of our world.

  6. Curiouscat says:

    Gonna run right out and get me a Ram 1500 TRX (super charged V8)

    • James 1911 says:

      Seems like a reasonable response to higher fuel costs.

      • Gaston says:

        Ironically may be a good time to buy. If you could save $10k off the price it’ll pay the fuel cost differential of the recent rise for 100k miles. That is if you were gonna buy one at gas prices 3months ago

  7. Delusional about inflation says:

    I paid 4.99 a gallon for diesel and few days days later on the way home it went up to 5.49. Sprinter nation got more expensive

  8. Swamp Creature says:

    My “Gas Station from hell” just posted $5.05/gallon for regular, topping their last $4.89 price that lasted over a year.

    • Anon1970 says:

      My nearest gas station (near San Francisco) is charging over $6 for regular today and over $7 for diesel.

    • Sauk Haven says:

      I’m in rural Western Washington State and my “Gas Station from hell” is giving yours a run for our money. They posted $5.69/gal last week. Scared to see what it is today.

      I’m sure we will all be hearing the victory crowing from this administration any day now. Sounds just like the last administration…

  9. Swamp Creature says:

    On Kudlow today some dude on the panel said oil will go back down to $50/barrel once a peace agreement with Iran is signed. He said all the inflation due to the War is transitory.

    • Waiono says:

      Did he happen to mention how far up his ass the stick was? What part of “worst energy crisis” did he overlook? The”gutted” Iran nation is landing cluster bombs and never before seen heavier payload munitions on its missiles in central Tel Aviv..

      Airline ticket(exact same flight)

      Mid March HI to Houston R/T $1,600
      3 days ago $2,600 but included flight credits

    • Rick Vincent says:

      “Transitory” haha! I didn’t know they brought comedians on his show.

  10. pass the potatoes please says:

    Good post, thank you.

    When grabbing a bite and filling up with gas at Casey’s gets too expensive, folks will drive to WalMart.

    I am guessing that those WalMart digital price tags will pay for themselves in short order.

    (Walmart’s diesel and fuel purchasing team meetings must be pretty interesting right now. I wonder what it costs to keep their fleet on the road for a day?)

    Of course, “kids my age” know there’s always Rice a Roni, Hamburger Helper, Tuna Fish, Baloney, Spam, Canned Peas and Corn, or my childhood favorite, Dry Milk (served as cold as possible.)

    We are about three generations from the widespread knowledge that if you never eat another chip from a bag in your life, that you will not perish due to starvation.

  11. Waiono says:

    PMI’s didn’t look good today either

  12. Frank says:

    $5 diesel ❓❓❓ We may see $10 – 15 diesel.
    Just drove by Chevron is a little CA town yesterday. Their premium gas was $6.69/gallon.
    1970’s 2.0?

    Oh, and don’t forget about that explosion at the Valero refinery in Texas. An internet search says
    “Yes, the massive explosion and fire at the Valero Port Arthur refinery in Texas on March 23, 2026, is expected to significantly affect its refining capacity.”

    New York Post reports that some California gas stations are charging over $8.00/gallon.

  13. SOL says:

    We all know inflation is transitory. All of it. 1 time shock, that keeps on shocking.

    Maybe they could change their metric to a “Petrol Equivalent” number and base the cost of fuel on “estimates”. That works really well for keeping the numbers low.

  14. Nicholas R says:

    I really hate politics entering economics discussions, but every time WTI jumps above $100, Trump makes a statement claiming the war along the lines the war is over. The markets react quickly bringing it back down regardless of validity. Maybe if this time is true, oil prices will retreat in a few months when Gulf production is fully online, but the damage to the Qatar gas production facilities will take five years to restore. This is bad news for everyone as data centers are consuming more and more energy.

    • Wolf Richter says:

      This tells you that the price of oil has been pure speculation, driven by maniacs. There hasn’t been any supply issue at all. In the 1970s, when there were supply issues, with people having trouble finding enough gasoline in big parts of the country, it didn’t matter what anyone said.

      • James 1911 says:

        Supply issues perhaps,but at least we had Chevelle SS’s/Ford Shelby Cobras/real 4×4 trucks/jeeps etc.!

        Now,,all we have is unibody death traps and lousy music,give me back the 70’s(minus asian war).

        • Derby says:

          A lot fewer people dying in the “unibody death traps”. I helped someone out of a wrecked car recently, she had T-boned someone at an intersection. She was pretty shook up, but physically just fine, basically wrapped in airbag pillows on multiple sides. Not to mention the crumple zone ate up most of the impact.

  15. Swamp Creature says:

    Wolf hasn’t posted the prices on his “Gas Station from heck” in a long time. Why not?

  16. Freeland says:

    One predictor of inflation is the US bond market. Inflation = nominal yield – TIPS yield. Currently, the 5 year predicts 2.61% inflation and the 10 year predicts 2.34% inflation. What is the bond market missing? Is it seeing a recession sometime out there in those timeframes?

  17. Steve says:

    Unlike during Covid, current job market will stifle “inflationary mindset”. No helicopter money either.

    People more likely to “hunker down”. Get ready for recession.

  18. tom says:

    Filled the work truck @ 4.59gal ( diesel ).

    Still, below 08 & 22 high for my area.
    Increased our rates.

  19. Eric86 says:

    Can’t wait for nearly 100% of these comments to be wrong

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