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 per gallon for the first time since March, averaging $3.999, due to a U.S.-Iran agreement on uranium enrichment and sanctions. However, prices remain 25% higher than last year, with regional disparities like California's $5.64 and South Carolina's $3.58 per gallon. The agreement aims to end hostilities and resume oil flow through the Strait of Hormuz, though disruptions and higher costs are expected to persist.