California diesel sits $1.64 above the national price as the "under $5" relief skips the IE

The U.S. on-highway diesel average fell to $4.83 a gallon in the week ending June 22, down 23 cents from the prior week and under $5 for the first time since mid-March, according to Energy Information Administration data. The national number is the one wire services led with. It is not the number that sets fuel surcharges for an IE carrier.

California diesel fell too — down about 25 cents on the week — but only to $6.47. That is $1.64 over the national average and the highest of any state EIA tracks. The West Coast region excluding California runs $5.24; the Gulf Coast, where refining capacity is concentrated, sits at $4.42. For an operator running drayage out of the ports or linehaul off the I-10 and I-15, the gallon costs roughly two dollars more than it does for a competitor loading in Houston.

The year-over-year gap is the part that compounds. National diesel is up about $1.06 a gallon from a year ago. California diesel is up $1.58 — half a dollar more, on a base that was already the country's highest. Part of that traces to the spring run-up in crude tied to the Strait of Hormuz disruption, which EIA's own outlook flags as the driver of elevated 2026 diesel and jet fuel prices. But the spread between California and the rest of the country is structural — refinery configuration, fuel specification, and state taxes — and it does not move when the national average ticks down.

The operating takeaway: a fuel-surcharge model indexed to the national DOE average, which is how many shipper contracts are written, understates what an IE fleet actually pays at the pump. When the national figure drops under $5 and the surcharge resets downward, the carrier's cost has not fallen to match. The relief in the headline is real for the country and thin for the region.