Gasoline prices have started to fall, and that is welcome news for drivers. After months of pain at the pump following the war with Iran and the disruption of traffic through the Strait of Hormuz, even modest relief is noticeable. But falling from crisis levels is not the same thing as returning to normal. That distinction may define the next several months in the oil market. The developing U.S.-Iran agreement has given traders a reason to mark down crude prices. Markets are forward-looking, and they have quickly priced in a scenario in which the…