US gasoline prices dropped below $4 per gallon for the first time since April as US-Iran deal optimism eases crude oil markets and energy costs.

"The next several weeks will be key - one major slip up could impact greatly prices moving forward. And with so many speedbumps in this situation..."

"Average gasoline prices fell in 47 states over the last week, with the national average dropping..."

Americans have collectively spent about $46 billion more on gasoline since the start of the war