Brent Crude Hits $103.60, Hormuz Disruptions Push Oil Higher

Why did oil prices climb Friday?

Brent crude rose 1% to $103.60 per barrel Friday on continued disruptions around the Strait of Hormuz. U.S. benchmark crude climbed 0.4% to $96.68 after erasing an earlier dip.

The move extends a three-week rally tied to the Hormuz closure. No tankers have passed through the strait since May 5, when Iran imposed a new reporting rule that halted transits. The waterway normally carries 20% of global oil supply.

Brent has now gained $6.22 per barrel since the closure began: a 6.4% climb in 17 days. U.S. crude is up $5.21, or 5.7%, over the same span.

What the crude move means for diesel

Crude oil accounts for roughly half the pump price of diesel. A $6 per-barrel move in Brent typically translates to 14 cents per gallon at the rack within two weeks.

Diesel was already at $4.48 per gallon nationally as of May 9, up $1.32 year-over-year. Friday's crude gain adds pressure to fuel costs that have climbed 41% since Hormuz flows began dropping in Q1.

For a five-truck fleet running 2,500 miles per week per truck at 6 mpg, every 10-cent diesel increase adds $208 to the weekly fuel bill. The $6.22 Brent rally since May 5 projects to roughly 15 cents at the pump: $312 per week for that same fleet once the crude move filters through to retail.

How long the supply squeeze lasts

The Hormuz closure has drained global oil flows by 6 million barrels per day: nearly 30% of the strait's normal volume. Aramco warned May 12 that storage is running low as the drawdown hits 100 million barrels per week.

U.S. crude inventories have fallen for four consecutive weeks, dropping 18 million barrels since mid-April. Refinery runs remain near seasonal highs, but input costs are climbing faster than wholesale diesel prices, squeezing crack spreads.

Peace talks between the U.S. and Iran briefly pulled Brent down to $97.38 on May 7, but the 3.8% drop reversed within 48 hours as no tankers resumed transit. The market is now pricing in an extended closure: futures curves show diesel staying above $4.40 through October.

The bill for small fleets

A 10-truck operation running 5,000 miles per week per truck at 6 mpg burns 8,333 gallons weekly. At $4.48 per gallon, that's $37,318 in fuel. If diesel climbs another 15 cents on Friday's crude move, the weekly bill rises to $38,568: a $1,250 increase with no corresponding rate relief.

Spot rates have been flat to down since March. DAT's dry van national average held at $2.14 per mile for the week ending May 16, unchanged from April. Contract rates are locked for most fleets through Q3. Fuel surcharges tied to DOE benchmarks lag pump prices by one to two weeks, leaving carriers exposed to the crude spike before surcharge adjustments catch up.

The White House floated suspending the 24.4-cent federal diesel tax through October, but no legislation has moved. Even if the tax cut passes, it offsets only 16% of the $1.32 year-over-year diesel increase, and none of the additional 15 cents projected from Friday's crude rally.