Diesel in California is back at the seven-dollar mark. AAA's statewide daily average hit $7.16 a gallon on August 24 — roughly $1.70 above the national average — as two shuttered refineries and record refining margins squeeze the most expensive fuel market in the country.
Not a record — but close to one
This isn't uncharted territory. California diesel peaked at $7.75 in April during the Strait of Hormuz disruption, then slid below $6.50 in July as tensions eased. The rebound since mid-August has been fast: the EIA's official weekly survey put California at $6.785 for the week of August 17, and AAA's daily reading crossed $7 within days. The same EIA week had the national average at $5.454.
The $1.70 gap
A truck burning 2,000 gallons a month pays roughly $3,400 more per month on California diesel than on the national average — before a single load is booked.
Why California, why now
The squeeze is structural, not just geopolitical. Phillips 66 finished shutting down its 139,000-barrel-a-day Los Angeles refinery last October, and Valero's Benicia plant — about 145,000 barrels a day — stopped making fuel in April. Together that's roughly 17% of California's refining capacity gone in under a year, in a state that can't simply pipe in product from the Gulf Coast.
What's stacking the price
Refining margins at all-time highs: the diesel crack spread topped $100 a barrel for the first time ever on August 17, closing at $102.20
Two refinery closures took roughly 17% of California's capacity offline — Phillips 66 Los Angeles and Valero Benicia
State costs on top: a 48.2-cent excise tax since July 1, plus cap-and-trade and Low Carbon Fuel Standard charges that add tens of cents more per gallon
Reported strikes on Russian and Middle East refining capacity have tightened global diesel supply, keeping export markets hungry for U.S. product
For carriers running I-5 or the ports, the math is simple and ugly: California fuel stops are now a line item that can decide whether a coastal lane pays at all. Fuel surcharges built on the national DOE average won't cover a $7 pump price — West Coast lanes need West Coast math.
Fuel is the market's loudest signal
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