AAA’s national average for a gallon of regular gasoline eased to $4.174 on Sunday, extending a decline that reached 18 cents over the prior week — the second straight week of falling pump prices — as gasoline cools off with the price of crude oil holding below $100 per barrel. Drivers are taking the relief as they embark on summer road trips, even as uncertainty lingers over how long it will last.

The pullback at the pump reflects May’s sharp crude decline working its way through the one-to-two-week wholesale-to-retail transmission lag, rather than this weekend’s renewed escalation in the Middle East. Brent crude settled around $93 a barrel Friday after sliding about 2% on weak Chinese demand, with Chinese crude imports falling to their lowest level in ten years. That softness, combined with the absence of a U.S.-Iran breakthrough, has kept downward pressure on fuel costs.

The relief has a clear ceiling, however. Pump prices remain elevated by historical standards — well above the levels of a year ago — and the weekend’s events are a reminder of how quickly the picture could change. Israel’s strike on southern Beirut on Sunday and the exchange of fire between U.S. and Iranian forces near the Strait of Hormuz both threaten to revive the supply-disruption premium that drove gasoline to four-year highs this spring.

State-level prices continue to span a wide range. California remains the most expensive market in the country at $5.99 per gallon, while Indiana is the cheapest at $3.59 — roughly 16% below the national average. Hawaii sits near $5.64. The spread reflects the usual mix of state taxes, environmental regulations, and refining and distribution costs that shape regional pricing.

Whether the second weekly decline extends into a third hinges almost entirely on crude. If the weekend escalation triggers Iranian retaliation or a suspension of the U.S.-Iran talks, the resulting risk premium could halt the pump’s descent within a week or two. If the diplomatic track holds and Chinese demand stays soft, drivers could see continued relief deeper into the summer driving season.

AAA has consistently framed the current environment as fragile, noting that pump prices will track the course of the war and the fate of the Hormuz negotiations more than seasonal demand. For now, the trend at the pump is lower — a rare piece of good news for households that have absorbed roughly a year of elevated energy costs tied to the conflict.

Continuing coverage: Gas Prices by State · Oil Prices · Geopolitics.