A spike in oil prices over recent days amid a resumption of fighting, however, threatens to push gas prices higher, erasing some of the relief delivered last month.
A key inflation gauge accelerated in April to the highest level in three years, the latest sign that spiking gas prices and higher food costs are squeezing Americans' finances.
Americans are facing price increases on everything from gas to groceries, prompting people to search for new ways to save.
President Donald Trump said Americans' financial situation was "not even a little bit" of a motivating factor for him reaching a deal to end the war in Iran.
The jump in prices last month owed in large part to a sharp rise in costs for products impacted by a global oil shock.
Diesel prices are climbing at a staggering rate across the country - and in California, they've reached some of the highest levels in the nation.