Diesel's 60% year adds 15 points to a carrier's operating costs

Fuel is 25% to 30% of a carrier's operating costs, according to Crypto Briefing ^[13]. Lift that line 60% ^[10] with volumes flat and total operating costs rise about 15% at the low end of the range, 18% at the high end ^[16]. The fuel share itself goes from 25% of the bill to roughly 35%, or from 30% to about 41% ^[17]. A carrier that cannot move rates 15% pays the difference out of margin.

Work backwards from the print. An average of $6.505 that is up roughly 60% year over year implies about $4.07 a gallon twelve months ago, so $2.44 of the pump price is new ^[15]. Ten or eleven days before the record, the average was $6.00 ^[5]. That is 50.5 cents in ten days, close to 5 cents a day ^[14]. A surcharge indexed to a prior-period average is collecting on a price that has already moved, and the shortfall compounds for as long as the trend holds.

Inventories are what hold the price up. 106.3 million barrels at roughly 13% under the five-year average implies an average near 122 million, so the shortfall is about 16 million barrels ^[11][18]. Agricultural diesel demand peaks during fall harvest ^[9]. Refinery maintenance season runs through the same weeks and temporarily reduces domestic output ^[8].

Diesel and jet fuel are both middle distillates from the same crude fractions, and Crypto Briefing says a surge in diesel demand forces refiners into allocation decisions that can push jet prices higher too ^[19]. An airline's fuel bill is exposed through the refinery, not through the market for diesel.

The inflation route is described in the source, not measured: transportation costs feed directly into the Producer Price Index, which pressures the Consumer Price Index ^[6]. The one dollar figure attached to the shock is Brown University's estimate of more than $46 billion added to US consumer fuel costs since the Iran-related conflict began ^[12]. Crypto Briefing did not say which Brown researchers produced it.

Both supply legs can reverse. Shipping through Hormuz, the route for roughly 20% of the world's oil, is disrupted by a live conflict ^[3], and the export restriction is a decision Moscow took after Ukrainian strikes on Russian refineries ^[4]. Either can be undone in a week, and a 16-million-barrel gap can be rebuilt once maintenance ends ^[18][8]. Anyone repricing a year of freight contracts off a record spot print, or hedging harvest fuel at $6.505, carries that risk ^[1]. The farmers Crypto Briefing calls relatively insulated are the ones who locked fuel contracts earlier in the year ^[7].

In my view short-dated surcharge language is worth more than an annual hedge here, because the last 50 cents of this move arrived in ten days ^[14] and a price built on a chokepoint and an export restriction can hand back the same 50 cents in ten. I would be wrong if the 16-million-barrel inventory gap widens instead of closing ^[18], in which case $6.505 becomes a floor.