In March, a carrier told its customers in Greece that weekly fuel reviews were an “exceptional measure”. Six months later, the weekly mechanism is still running, and the truck surcharge sits at 15 percent. What was presented as a bridge through disruption has become part of the road itself.

You are signing a pricing mechanism, not a freight rate.

That distinction matters when oil is above 100 dollars a barrel amid continuing conflict in the Middle East, and fuel surcharges are climbing across all transport modes. A freight rate appears to offer a price. A mechanism offers a rule for changing the price. When the rule is activated weekly, a shipper is no longer managing an occasional adjustment. The shipper is managing a moving cost input.

The numbers show how quickly that movement can reach an invoice. DHL Aviation’s ex-Hong Kong long-haul cargo fuel surcharge rises to 12.30 Hong Kong dollars per kilo from 21 September. It was 11.30 this week and 6.80 in early July, an increase of more than 80 percent in about 11 weeks. The surcharge is normally calculated monthly, but it switches to weekly calculation whenever the jet fuel index for Asia and Oceania rises above 100.99 dollars a barrel. The latest calculation uses a jet fuel price of 169 dollars a barrel, and the weekly mechanism has run continuously since the end of March.

The same logic is visible on the road. In Greece, Maersk replaced its monthly fuel surcharge review with weekly calculations because of the Middle East situation and rising fuel costs. Six months later, it says it will review weekly for as long as necessary, while the truck surcharge is currently 15 percent. Its Nordic emergency inland fuel mechanism is also calculated weekly, and diesel there has risen by around 0.60 euro per litre since the latest escalation in the Middle East.

This is not a story about carriers arbitrarily changing prices. Operators face a cost that can move faster than a contract cycle, and they can only partially pass increases on to customers. Some of the shock is absorbed inside an already low-margin industry. The commercial problem for shippers is different: the invoice becomes harder to predict, harder to compare across modes, and harder to reconcile with a budget approved under calmer assumptions.

The external risk is not easing. Oil prices rose by roughly 50 dollars a barrel over the past year, while November Brent was trading around 107 dollars. Analysts at a logistics research house warn that low reserves and disrupted supply mean the oil market looks like it is approaching a “crisis point”, even though bunker fuel supply has so far held up. The threats extend beyond the Strait of Hormuz. Attacks have hit a major Saudi pipeline that exists precisely to export oil without using Hormuz, and attacks are also pressing on Russian oil supply.

Picture a logistics manager opening the freight bill every Friday. The shipment count is stable, the lanes have not changed, and the transport plan is intact. Yet the fuel line is different from the previous week. The manager must explain the variance to finance, decide whether to accept the charge or challenge its calculation, and update the forecast without knowing whether the next change will arrive in a month or in days. The work is not simply paying more. It is absorbing less certainty.

For a small haulier, the same week can look different. Diesel rises, but the customer contract allows only partial recovery. The operator either absorbs part of the increase, reduces margin, or tries to renegotiate while still keeping vehicles moving. A weekly mechanism can be commercially reasonable for both parties and still create pressure on both sides. It also changes the economics of moving cargo and of alternative fuels, because higher fossil fuel costs alter the comparison between available options.

The story therefore has a clear arc. The temporary measure is introduced during an energy crisis. A trigger remains above its threshold. Weekly calculations become familiar. Six months pass, and the exception is now the operating rhythm. The question a shipper should have asked in March was not only, “What is the surcharge today?” It was, “What exactly makes this weekly, which index controls it, and what brings it back to monthly?” Without those answers, a rate agreement can conceal a variable contract.

Shippers can reduce the exposure without pretending that the underlying cost is stable. 1) Put the fuel index, trigger threshold, calculation formula, currency and pass-through percentage in writing. 2) Set the review cadence and a defined review date, including what happens when the emergency condition ends. 3) Add a volatility line to the budget instead of hiding the risk inside the base rate. 4) Decide deliberately between a fixed all-in price and a managed index, based on the value of certainty, the lane and the contract horizon. 5) Reconcile each adjustment to the named index before approving the bill. The aim is not to eliminate fuel volatility. It is to stop an exceptional mechanism from becoming an unexamined permanent cost.