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 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. 26 — two days before the war in Iran began — and a year ago, the average price of gas was $3.171, according to data from AAA. Gas prices in the U.S. are the highest they have been since late July 2022, said the automotive group. President Trump has promised that when the war in Iran ends, that gas prices will "drop like a rock." It is unclear when the war will end, but even when it does and the Strait of Hormuz is reopened, gas prices could still remain high, according to experts. And prices could go up higher the longer the strait, which is a crucial route for oil and natural gas trade, stays closed, said Kevin Book, co-founder of ClearView Energy Partners, a research firm. "When inventories are low and you can't get oil out of the ground or out of the strait, you should expect prices to keep rising at least until demand capitulates and starts to contract," Book told NPR's Ayesha Rascoe on Weekend Edition on Sunday. "So, we may be weeks or even months, depending on how long the strait stays closed, from the peak of prices from this