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Diesel's 74% climb implies roughly 15% higher operating costs for truckers
US diesel's record $6.59 a gallon, up 74% in a year per the EIA, implies trucking operating costs about 15% higher on an industry rule of thumb. Truckers run on margins too thin to absorb that, so the increase moves into the price of whatever they haul.
The Investor · Invest desk
What happened
- The near-complete closure of the Strait of Hormuz has sharply cut the flow of the crude oil that refiners turn into diesel, gasoline, jet fuel and heating oil.
- Ukrainian attacks on Russian refineries, which intensified through 2026, have restricted how much Russian diesel reaches the global market.
- After more than six months of US-Iran war, most companies and countries have used up whatever extra fuel supplies they held, according to the analysis Fortune published.
- A trucking industry research firm estimates that a 20% increase in fuel costs translates into about a 4% increase in operating costs.
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Why it matters
- cost Air travellers pay part of the diesel bill too, because jet fuel comes from the same refining process and fares have risen alongside it.
- exposure Households heating with oil go into winter facing higher bills, since heating oil is made the same way as diesel and shares its shortage.
- constraint Transit agencies pay more to run diesel buses and trains at the same moment expensive gasoline pushes more riders onto them.
Divide the research firm's 4% by its 20% and the estimate says fuel is about a fifth of a truck's operating costs [1]. Apply that fifth to a 74% rise in the pump price [1] and operating costs come out about 14.8% higher [2]. That result assumes fuel was still a fifth of the bill a year ago and that nothing else on the cost sheet moved. The source's own dollar figures put the year-ago price near $3.81, and a $2.78 rise on that base is closer to 73% than 74%; at 73% the estimate is 14.6% [3].
Location moves the answer more than rounding does. The 15% is a national-average figure, and a fleet's own number depends on where it fills up. California's average has topped $8 a gallon while the Gulf Coast pays $6.03 [9], a gap of at least $1.97 a gallon, or about a third [4]. The analysis Fortune published puts part of that gap down to the many refineries and terminals along the Gulf [10].
The buffer that analysis describes as spent is physical inventory [2]. The piece does not address fuel hedges or forward purchase contracts, so it cannot show how much of the $6.59, if any, fleets still have covered at older prices. It describes a market with little stock left, where buyers compete for what is available and for what little is produced each day [14]. Diesel has risen faster than gasoline and stayed higher for longer [13].
Demand could give way before supply returns. The analysis says farmers facing high fuel costs may restrict or postpone planting and harvesting [7]. A postponed harvest leaves diesel for other buyers and less food for markets. I think the price stays tied to crude flows through the Strait of Hormuz [3] and to Russian refinery output [4], because the inventory that would have let prices lag the disruption has been drawn down [2]. A falling EIA weekly average while the Strait stays mostly shut would prove that wrong, since it would mean demand cuts are rationing the fuel.
What to watch
- The EIA's next weekly diesel readings, and whether the national average falls while the Strait of Hormuz stays mostly closed.
- Any reopening of the Strait of Hormuz or a letup in Ukrainian strikes on Russian refineries.
- Heating oil prices as winter approaches, since the fuel comes off the same refining process as diesel.