In the week to 14 September, a gallon of regular gasoline in the US rose 16 cents, to $4.32. Here is the chain behind it. Brent crude closed at $97.92 on 8 September. Then drones hit Saudi Arabia’s pipeline to the Red Sea, and loadings stopped at its Red Sea port, Yanbu. On 15 September Brent closed at $108.75, the highest since May: almost $11 in a week. About half of what Americans pay for a gal

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