US gas prices fall below $4 for 1st time since March, but still 25% higher than last year

U.S. gas prices fell below $4 a gallon for the first time since March, averaging $3.999, following a U.S.-Iran agreement to dilute Iran's enriched uranium and waive sanctions. Despite the drop, prices remain 25% higher than last year, with regional disparities and ongoing supply chain disruptions due to the Strait of Hormuz situation and delayed oil production.