(Bloomberg) — President Joe Biden’s effort to tame pump prices by tapping government oil stockpiles could backfire for one simple reason: American gasoline prices more closely track international, rather than U.S., oil benchmarks.

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That matters because a 50 million-barrel flood of crude from government stockpiles will increase domestic supplies, widening the price differential between U.S. benchmark WTI and its global counterpart Brent.

Brent’s premium over U.S. crude futures climbed to a six-week high in the hours after the White House announced it would release oil from the Strategic Petroleum Reserve in concert with other nations. That means U.S. demand centers that typically rely on imports may have to pay more for their crude, albeit temporarily, which could translate into higher gasoline prices.

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“U.S. gasoline prices reflect Brent since we import gasoline and blendstocks from overseas, especially into the the East and West Coasts,” said Kevin Book, managing director of research firm ClearView Energy Partners.

Bets that the spread between WTI and Brent will widen further are increasing too. On Tuesday, 6.5 million barrels worth of crude traded on the chance that the spread widens past $5 within a few months time.

(Updates with details on options trade in the final paragraph.)

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By James Carter

A Senior writer & Editor, James is a postgraduate in biotechnology and has an immense interest in following news developments. Quiet by nature, he is an avid Lacrosse player. He is responsible for handling the office staff writers and providing them with the latest updates happenings in the world. He writes for almost all sections of Editorials 24.