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Men sit is a small boat moored in the Panj Pele fishing port in Bandar Abbas in southern Iran on September 5, 2026. [AFP]

Iranian authorities on Sunday announced they were raising the price of petrol for heavier consumers, as the United States steps up sanctions seeking to isolate the country's economy.

Iran's quota system prices petrol in three tiers -- 1,500 tomans per litre for a consumer's first 60 litres in a given month, 3,000 tomans per litre for their next 50, and 5,000 tomans per litre after that. The toman is an informal unit equivalent to 10 Iranian rials.

On Sunday, government spokeswoman Fatemeh Mohajerani said the price for the third tier would double to 10,000 tomans (about 4.5 US cents).