Gas prices are climbing again. See the states where it is the most and least expensive.

The national average price for a gallon of regular gas rose to $4.28 on Thursday, up 6 cents in 24 hours and 13 cents over two days, according to AAA. That is $1.08 more per gallon than drivers paid a year ago. The increase comes as the six-month war between the US and Iran enters a new phase for global oil supplies, with US forces striking several Iranian oil tankers in recent days and Iran attacking ships and a US base in Jordan on Tuesday. Iran-backed Houthi rebels have also set Saudi oil facilities ablaze and threatened shipping in the Red Sea.

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