California diesel eases slightly but stays above $8 a gallon
Government and AAA data show California diesel prices dipped in early October but remain about $1.88 a gallon above the national average.
California diesel prices eased slightly in the latest official weekly data, but they remain above $8 a gallon. The U.S. Energy Information Administration published its figures on October 6, 2026, showing a California average of $8.082 for the week ending October 5, down from $8.181 the week before.
AAA's California price page, updated for October 8, showed diesel at $8.3483 a gallon, down about 3.4 cents from a week earlier. The same page showed regular gasoline at $6.3486. As of October 8, 2026, the figures show a small decline in diesel rather than a new spike.
What the latest figures show
The EIA series is a weekly average that includes taxes. For the same week, the national diesel average was $6.199 a gallon, down from $6.382. California fell by less than the nation, so California's premium over the national average widened to $1.883 a gallon from $1.799. California's diesel premium over the national average widened to $1.883 a gallon, even as the state price fell.
The AAA figures are daily snapshots, so they do not match the EIA weekly series exactly. AAA's California page does not state a national diesel figure, so the national comparison in this report uses the EIA numbers. The next EIA release is scheduled for October 14, 2026.
The overseas supply shocks behind the prices
Arise reported in August that disruptions to tanker traffic through the Strait of Hormuz had pushed California diesel to a record $7.75 a gallon in April, citing AAA data. The same article said prices fell below $6.50 in July after exports recovered following a memorandum of understanding between Washington and Tehran. The latest AAA and EIA figures are above that April peak.
Andy Lipow of Lipow Oil Associates, as cited by Arise, attributed about 800,000 barrels a day of lower Russian diesel exports to Ukrainian drone attacks on Russian refineries. He also estimated that disruptions around the strait had affected about 1.2 million barrels a day of Middle Eastern diesel exports.
Dan Yergin of S&P Global said in a CNBC interview on July 31 that about six million barrels a day of global refining capacity was offline. Arise also reported that Houthi attacks shut a Saudi refinery in Jizan, removing about 200,000 barrels a day of capacity at least until the end of August. These figures date from July and August. The sources reviewed for this report do not confirm the status of the strait or the Russian refineries as of October 8.
Why California pays more than the national average
According to Lipow, as cited by Arise, California relies more heavily on imported crude, which is more expensive, and requires a specialised diesel formulation. He also pointed to state environmental regulations and to state excise and sales taxes as factors in the state's prices.
The sources do not break down how much of the current premium each factor explains.
“California's diesel premium over the national average widened to $1.883 a gallon, even as the state price fell.”
What fleets and shippers should watch
In August, Kevin Book of ClearView Energy Partners told CNBC that diesel prices were unlikely to ease significantly until Russian refineries recovered and Middle Eastern exports rose, as Arise reported.
The sources reviewed do not address freight rates, retail pricing or shipping volumes for the holiday season, so this report does not estimate those effects. For logistics-dependent businesses, the most recent official figures show California diesel above $8 a gallon and well above the national average. The next official weekly figure is due on October 14, 2026.
