Oil prices climbed on October 30 after a tanker in the Strait of Hormuz was hit by explosive devices attached by a small boat, according to the UK Maritime Trade Operations service. The incident renewed concerns about supplies moving through one of the world’s most important energy corridors. ([ca.marketscreener.com](https://ca.marketscreener.com/news/oil-set-for-fourth-monthly-gain-as-hormuz-tanker-attack-highlights-supply-risks-from-war-ce785fdad08ff622?utm_source=openai))
Brent’s expiring December contract settled at $117.64 a barrel, up 2.4%, while the more actively traded January contract reached $113.43. Drivers could see some effect within days if wholesale fuel markets remain elevated, but a brief oil spike may largely disappear before reaching retail pumps. The outcome will vary considerably between countries. ([ca.marketscreener.com](https://ca.marketscreener.com/news/oil-set-for-fourth-monthly-gain-as-hormuz-tanker-attack-highlights-supply-risks-from-war-ce785fdad08ff622?utm_source=openai))
Why the tanker attack moved oil prices
Hormuz connects major Gulf producers with international markets. Before the current disruption, the strait served as a route for roughly a fifth of the world’s oil and natural gas supplies. That makes an attack capable of moving prices even when the affected vessel represents only a small share of global trade. ([apnews.com](https://apnews.com/article/852851049c1ede6811516fe92700dcbe?utm_source=openai))
Markets price future risk as well as immediate shortages. An incident can raise expectations of:
- further attacks or tighter restrictions on shipping;
- higher insurance and tanker-charter costs;
- slower deliveries and longer waiting times;
- greater reliance on pipelines and alternative ports;
- refinery supply problems in regions dependent on Gulf crude.
The US Energy Information Administration had already warned in its October outlook that elevated tanker and insurance costs were increasing refiners’ delivered crude costs. It also expected disruption around Hormuz to create greater short-term price volatility than its central forecast captured. ([eia.gov](https://www.eia.gov/outlooks/steo/marketreview/crude.php?utm_source=openai))
When could petrol and diesel prices rise?
There is no universal delay between an oil-market shock and a change at the pump. The first movements can appear within several days in markets where wholesale prices and retail tariffs are updated frequently. Elsewhere, existing stocks, slower pricing cycles or government controls can postpone the change for weeks.
Retailers do not buy fuel directly at the Brent price displayed on financial markets. Crude must be transported, refined and converted into products such as petrol, diesel and jet fuel. Those products then pass through storage terminals, wholesalers and distribution networks before reaching service stations.
A station may therefore continue selling fuel purchased before the latest oil increase. If Brent falls again quickly, only a limited part of the spike may reach motorists. If crude and wholesale products remain expensive, successive deliveries are more likely to carry the increase into retail prices.
Why a 10% oil rise does not mean a 10% pump-price rise
Crude is only one component of the amount displayed on the pump. The final price also includes:
- refinery costs and profit margins;
- the market price of finished petrol or diesel;
- biofuel-blending expenses;
- shipping, storage and road distribution;
- wholesale and retail margins;
- excise duties, carbon-related charges and sales taxes.
Many fuel duties are fixed amounts per litre or gallon. A fixed tax does not rise merely because crude becomes 10% more expensive, which normally makes the percentage change in the full pump price smaller than the percentage change in oil.
Consumption taxes calculated as a percentage, including VAT or GST in many countries, behave differently. When the pre-tax fuel price rises, the amount collected through these taxes also increases.
Diesel and petrol may not move together
Brent provides a useful indication of the direction of the crude market, but it cannot predict the exact change in petrol or diesel prices.
Each finished fuel has its own supply-and-demand balance. Diesel may rise faster when refinery maintenance, industrial demand or limited imports tighten the middle-distillate market. Petrol can behave differently because of seasonal driving demand, fuel-blend requirements and regional refinery availability.
This means motorists could encounter a noticeable diesel increase even when petrol moves only modestly—or the reverse. Wholesale petrol and diesel prices are generally more useful short-term indicators for pump prices than crude alone.
Currency movements will shape the impact
Oil is primarily traded in US dollars. For motorists outside the United States, the local exchange rate can either reinforce or soften an oil-price increase.
If the euro, pound, Canadian dollar, Australian dollar or another local currency weakens against the US dollar, imported crude and refined fuel become more expensive even if the dollar price of oil is unchanged. A strengthening currency can absorb part of the increase.
Currency effects help explain why pump prices in two countries can follow different paths after the same global oil shock.
The effect will differ by region
United States and Canada
North American prices will reflect not only crude benchmarks but also refinery operations, regional wholesale markets, inventories and transport constraints. Prices can vary sharply between states or provinces because taxes and supply networks differ.
Europe and the United Kingdom
Exchange rates, relatively high fuel taxes and dependence on internationally traded refined products all matter. Fixed duties can moderate the percentage movement in the total price, while VAT increases with the taxable portion of the price.
Australia and New Zealand
International refined-product prices, shipping costs and local currencies are particularly important. Changes can feed through according to local retail pricing cycles rather than immediately following Brent.
Price-controlled or subsidised markets
In countries where governments regulate or subsidise fuel, consumers may initially be shielded from daily market movements. The cost may instead appear in public finances or arrive later through a larger official price adjustment.
What motorists should watch next
One day’s Brent move is less important than what happens over the following week or two. The clearest warning signs of sustained pressure are:
- Brent and other crude benchmarks remaining elevated rather than reversing the initial jump.
- Further attacks or restrictions affecting ships around Hormuz.
- Rising wholesale petrol and diesel prices.
- Higher tanker, freight and maritime-insurance costs.
- Refinery outages or falling regional fuel inventories.
- A weakening local currency against the US dollar.
The October 30 attack has increased the risk premium already built into oil. It does not, by itself, determine how many cents or pence will be added at any particular station. A rapid easing of tensions could limit the retail impact; prolonged disruption would make broader and more persistent fuel-price increases much more likely.
Sources
- Associated Press — ExxonMobil and Chevron top Q3 estimates on higher prices and strong output — https://apnews.com/article/852851049c1ede6811516fe92700dcbe
- Reuters — Oil jumps 2%, settles at six-month highs on fears of escalation in Iran — https://ca.marketscreener.com/news/oil-set-for-fourth-monthly-gain-as-hormuz-tanker-attack-highlights-supply-risks-from-war-ce785fdad08ff622
- https://uk.marketscreener.com/news/oil-set-for-fourth-monthly-gain-as-hormuz-tanker-attack-highlights-supply-risks-from-war-ce785fdad08ff622
- https://finance.yahoo.com/news/oil-rises-supply-concerns-houthis-022725347.html
- https://www.marketscreener.com/news/oil-set-for-fourth-monthly-gain-as-hormuz-tanker-attack-highlights-supply-risks-from-war-ce785fdad08ff622
- https://strategicenergymap.org/dashboard/
- https://tankerbrief.com/
- US Energy Information Administration — Short-Term Energy Outlook: Crude oil — https://www.eia.gov/outlooks/steo/marketreview/crude.php
- https://www.brecorder.com/news/40446647/oil-set-for-fourth-monthly-gain-as-hormuz-tanker-attack-highlights-supply-risks
- https://new.streetinsider.com/Commodities/Oil%2Bprices%2Bset%2Bfor%2Bfourth%2Bstraight%2Bmonthly%2Bgains%2Bas%2Btanker%2Battack%2Bhighlights%2Bsupply%2Brisks/27259742.html
- https://helios-intel.com/watch/na/2026-10-30-pm/
- https://www.agilefactornews.com/briefing/morning-2026-10-30/
- https://www.industryweek.com/supply-chain/news/55388479/strait-of-hormuz-watch-weekly-snapshot-of-energy-disruptions-and-maritime-conditions?o_eid=6673F5709401H9K&rdx.ident%5Bpull%5D=omeda%7C6673F5709401H9K
- https://www.eia.gov/outlooks/steo/pdf/steo_text.pdf?amp%3Butm_source=openai&os=os
- UN Trade and Development — Strait of Hormuz disruptions: The burden of oil price shocks on vulnerable economies — https://unctad.org/system/files/official-document/osginf2026d3_en.pdf
- https://www.eia.gov/outlooks/steo/archives/aug26.pdf
- https://test-assets-opsaa.iica.int/storage/resources/resource_1774977798_en.pdf
- https://unctad.org/system/files/official-document/osginf2026d2_en.pdf
- https://www.oni.navy.mil/Portals/12/Intel%20agencies/piracy/WTS/20260401%20WTS.pdf?ver=hTtRWqAnMBHPJBm9lThFvg%3D%3D
- https://en.wikipedia.org/wiki/2026_Strait_of_Hormuz_crisis
Marcel Macko
I’m most interested in technology, the internet, bizarre news, and stories that make you stop and think, “There’s no way this can actually be true.” I follow what’s happening both at home and around the world and pick the topics I think are worth paying attention to. On Pitchoviny, I try to present them simply, factually, and without unnecessarily sensational headlines.
