“Maxed Out!” GasBuddy Says 5 California Gas Stations Hit $9.999 For A Gallon Of Diesel, The Highest Price Their Systems Allow
California diesel pumps are hitting a number their hardware was never designed to display, and the price driving them there just shattered a national record that had stood for four years.
Five diesel pumps in California have run out of digits. The dispensers are showing $9.999 a gallon, the highest figure their hardware can display, according to a September 10, 2026 post from GasBuddy head of petroleum analysis Patrick De Haan, who cited the fuel-price app’s real-time crowdsourced data. As of this writing, no other outlet has independently corroborated the count or identified the stations, and GasBuddy’s real-time feed is the sole source. We are not naming stations, cities, or brands because that information is not in the sourcing, and we are not alleging any retailer chose the number on the display.
A Hardware Ceiling on the Display
The $9.999 figure is almost certainly a physical limit rather than a posted rate. The precedent is well known. During the 2008 oil spike, older mechanical pumps installed decades earlier could not show a price above $3.99 a gallon because their displays had a fixed number of digits. Retrofitting or replacing those units cost an estimated $10,000 to $15,000 per pump, a bill many small operators could not absorb. A ceiling at $9.999 today is the same category of constraint with one additional digit of headroom.
Record Prices Behind the Maxed-Out Pumps
Those five displays are the extreme edge of a genuine record. The U.S. Energy Information Administration put California’s average diesel price at $7.76 a gallon as of September 9, 55 cents higher than a week earlier and $2.81 higher than a year earlier. AAA’s figure for the same date was $7.87.
Nationally, diesel just set a fresh all-time high. The U.S. Energy Information Administration reported an average U.S. retail diesel price of $5.97, up 3.7 cents on the week and $1.97 higher than a year earlier, surpassing the U.S. Energy Information Administration’s previous record of $5.81 set in June 2022. AAA showed a record $5.94 on the same date.
A California Pattern in 2026
The state has produced outlier prints all year. In March 2026, a Chevron (NYSE:CVX | CVX Price Prediction) station in the remote desert stop of Fenner was reported charging $9.69 a gallon for regular gasoline. In early May 2026, a Downtown Los Angeles Chevron was reported at $8.29 for regular and $8.89 for diesel, with drivers describing fill-ups of $100 to $110. Those were separate earlier incidents at different stations preceding today’s report.
Regulators Are Already Watching
California’s Division of Petroleum Market Oversight, led by director Tai Milder, issued an enforcement bulletin and consumer advisory on March 19, 2026 and opened an investigation into outlier pricing in the Los Angeles and San Bernardino areas. The agency subpoenaed data from the state’s five major refiners under Senate Bill X1-2, the price-gouging law enacted in a 2023 special session. The probe is active and unresolved. No allegations have been proven.
Why Diesel, Why Now
The pressure is coming from several directions at once. The U.S. Department of Energy has said U.S. refineries are running at about 98% of capacity. Heavy Duty Trucking reports that since the U.S. attacked Iran in February, Iran’s control of the Strait of Hormuz has scrambled regional oil logistics. Heavy Duty Trucking also cites Ukrainian drone strikes cutting Russian refinery output and falling Chinese refiner output. Crude sits in the upper end of its recent band, with Heavy Duty Trucking placing prices between $90 and $100 per barrel.
Where the Cost Actually Lands
Diesel moves freight, tractors, and food. A record at the rack shows up in grocery aisles, restaurant menus, and the price of anything trucked across the country. Households already feel it: the national average for regular gasoline reached $4.157 a gallon the week of September 7, and the University of Michigan consumer sentiment index stood at 55.2 in July, still below the 60 threshold the survey associates with recessionary conditions. The maxed-out pumps GasBuddy is describing are the visible edge of a real crisis in the state with the country’s highest fuel prices, and the regulator with subpoena power is already inside the market.
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AJ has spent the past 10 years writing about financial markets at The Motley Fool. His coverage centers on technology stocks and the broader macroeconomic trends, from interest rates to geopolitics, that shape where markets are headed next. AJ is drawn to the stories where big-picture economics and individual companies collide.
