U.S. refiners gain edge as tanker freight reaches $30–$35 per barrel

Freight from the U.S. Gulf Coast to Asia has climbed to about $30–$35 per barrel, Reuters said, from roughly $5 a year earlier, changing relative refinery costs. That jump followed shipping disruptions tied to the Iran conflict, which widened discounts on Canadian and Venezuelan heavy crude and lifted transport costs for Asian buyers.

U.S. Gulf Coast refiners gained a cost advantage over those rivals.

Security threats around the Strait of Hormuz, higher insurance premiums and longer shipping routes reduced tanker availability. Strong diesel and other refined-product prices helped offset those expenses. Oil & Gas 360 linked the combination to stronger third-quarter earnings at major U.S. operators Valero Energy, Phillips 66 and Marathon Petroleum.

Takeaway: The freight edge rests on discounted heavy crude and heavy-processing capacity.

What changed in crude economics?

The wider Western Canadian Select (WCS) discount to West Texas Intermediate (WTI) increases the value of heavy-crude processing for Gulf Coast buyers when the spread widens. Phillips 66 executives estimate that every $1 increase in that discount produces about $140 million in financial benefits.

The estimate reflects the company’s Canadian heavy-crude exposure. It does not specify a period for recognizing the benefit.

More than 70% of Gulf Coast refining facilities are configured to process heavy crude, the heavier oil grades discounted by producers in Canada and Venezuela. That capacity gives operators access to cheaper barrels than lighter U.S. grades.

Valero executives also cited shorter transportation routes as an advantage over European refiners supplying Latin American fuel markets.

Takeaway: Refiners with heavy-crude flexibility can capture wider Canadian and Venezuelan feedstocks discounts.

Which refiners turned freight into margin?

Oil & Gas 360 reported that U.S. refining margins more than doubled during the third quarter. Strong diesel and other product prices more than covered higher transport expenses, helping produce stronger quarterly results for the three major operators named above.

Oil & Gas 360’s analysis says refineries equipped for heavy crude, with reliable transport and favorable product markets, may generate stronger margins than competitors dependent on long-distance imports. For energy investors, the regional crude price differential (price gap) can change refinery profitability independently of benchmark oil prices.

Takeaway: Lower delivered crude costs and strong product markets explain the third-quarter margin jump.

How much freight risk did operators lock in?

Some companies secured shipping arrangements before the conflict intensified. Phillips 66 secured more than 40 time-charter vessels (ships hired for a contracted period), covering about 40% of its asset-based shipping requirements (company-controlled tanker needs). That coverage limited exposure to higher spot freight rates, or current tanker prices.

Valero, PBF Energy, Marathon Petroleum and Suncor Energy similarly arranged chartered fleets before the conflict intensified. The source does not disclose charter rates, contract lengths or residual spot exposure, so the size of each company’s freight protection remains unquantified in the material reviewed.

Takeaway: Chartered vessels reduce spot-rate exposure, although the source does not quantify the savings.

Can the advantage persist through 2027?

Oil & Gas 360 says the resulting cost advantage could extend into 2027. Marathon expects record Canadian heavy crude processing during the fourth quarter and anticipates elevated refining margins through at least mid-2027. HF Sinclair executives also expect favorable crude discounts to persist through 2027.

Those are management outlooks, not guaranteed results. HF Sinclair explicitly ties its view to shipping conditions and global petroleum supply. The source offers no sensitivity table showing what lower tanker rates, renewed security threats or an increase in global crude supply would do to either forecast.

Takeaway: The 2027 case rests on company forecasts and continued access to discounted heavy crude.

What could widen discounts and hurt producers?

Higher freight costs can restrict export opportunities for Canadian and Venezuelan producers. That limitation can deepen regional price discounts, which helps U.S. refiners acquire heavy feedstocks but reduces the revenue producers receive for each heavy barrel sold overseas.

Four variables will decide whether the advantage persists: maritime security, tanker availability, refining capacity and the recovery of international petroleum trade. Strong product markets and access to heavy crude support the current case, but the source does not assume those conditions stay unchanged.

Takeaway: Tighter shipping can help refinery margins while worsening producer realizations.

The source says its analysis is informational, not investment, legal or financial advice, and rests on publicly available information and market conditions that can change without notice.

Watch item: The key measure is whether refining margins stay elevated through mid-2027 as tanker availability, maritime security and international petroleum trade change. The source offers no numerical margin target, so the forecast remains open to revision.