US gas prices back up to an average of $4 a gallon as Iran war heats up

U.S. gas prices have risen to an average of $4 per gallon as tensions between the U.S. and Iran escalate. The national average is up from $3.14 a year ago, with some states paying significantly more. Rising oil prices, including Brent crude at $86.46 and U.S. crude at $79.91 per barrel, contribute to the increase, impacting affordability ahead of midterm elections.