Gas prices are inching closer to $4 a gallon. Overnight, the average price of regular gas in the U.S. rose to $3.97, according to AAA, more than a dollar higher than when the war in Iran began last month.RELATED STORY | Iran war pushes gas prices higher as Trump urges allies to help protect shipping routesAverage gas prices in Utah and Michigan climbed above $4 Tuesday. There are now 11 states with gas prices average more than $4 per gallon. They include: California ($5.82) Washington ($5.29) Hawaii ($5.28) Oregon ($4.87) Nevada ($4.81) Arizona ($4.61) Alaska ($4.54) Illinois ($4.21) Idaho ($4.17) Utah ($4.02) Michigan ($4)California has the highest average gas price in the U.S. at $5.82 per gallon, up by $1.19 per gallon from a month ago. Oklahoma has the most affordable gas at $3.26 per gallon, which is still 89 cents more than a month ago.RELATED STORY | Trump asks allies to deploy warships as Iran vows to block oil flowThe surge in prices over the past month has been triggered by rising oil prices the result of an Iranian blockade of the Strait of Hormuz.Also, gas prices are starting to climb just as the spring break travel season gets underway.This time a month ago, gas prices averaged $2.95 per gallon.The last time average gas prices averaged above $4 per gallon was August 2022, as average gas prices remained above $4 for the months following the start of the Ukraine/Russia conflict. ...read more read less