Gas prices went up more than 30 cents a gallon last week. How high could they go?

Gasoline prices are displayed at a Mobil gas station on April 29 in Portland, Ore. Jenny Kane/AP hide caption toggle caption Jenny Kane/AP Gas prices in the U.S. have gone up more than 30 cents a gallon in the last week and are slated to continue rising as the Strait of Hormuz remains closed amid the Iran war. The cost for regular gas as of Sunday is an average $4.446 — a week ago it was $4.099, according to AAA's fuel site . U.S. gas prices were an average $2.98 on Feb. …