The US average price for regular gasoline fell to $3.999 per gallon on June 17, 2026, marking the first time prices have been below $4 since March 30 of this year [1, 2, 3, 4, 5, 6, 7, 8]. Indiana reported the lowest average price by state at around $3.40 per gallon [1, 2, 3, 4, 5, 6, 7].
Gasoline prices peaked at $4.56 per gallon nationwide on May 21, 2026, before this recent decline [1, 2, 3, 4, 5]. The fall follows a memorandum of understanding (MOU) signed on June 14 between the US and Iran to end the war and reopen the Strait of Hormuz for oil shipments [1, 2, 3, 4, 5, 7, 8]. The war had blocked this vital passage, which handles about 20% of the world's oil and liquefied natural gas, disrupting global supply and pushing prices sharply higher [6, 8].
Despite the US importing relatively little oil from the Middle East, global market effects from the region impact US fuel prices [1, 2, 3, 4, 5, 7]. Many oil production and refining facilities in the Middle East were nearly shut down or damaged during the conflict, requiring months to restore full output [1, 2, 3, 4, 5, 7]. Analysts estimate it may take three to four months for oil tankers to fully resume operations in the Persian Gulf, with much longer needed to replenish lost supply. Matt Smith, Chief Analyst at Kpler, said, "油輪恢復正常通行可能需要3至4個月，而補足戰爭期間流失的供應則需更長時間。" [1]
The International Energy Agency reported that OECD countries’ oil stocks fell to their lowest levels since 1990 due to war-related supply disruptions and stock drawdowns in May 2026 [1, 2, 3, 4, 5, 7]. Brent crude oil also saw a steep drop, falling below $78 per barrel on June 17 after peaking near $120 in late March [6, 8]. Diesel prices remain above $5 per gallon but have declined notably from recent highs [8].
California continues to have the highest gas prices in the US, with an average of about $5.64 per gallon as of June 17 [6]. One year ago, average US gas prices were around $3.18 per gallon; pre-war prices in February 2026 were about $2.98 per gallon [6, 8].
Experts agree gasoline prices are unlikely to return to pre-war levels of around $3 per gallon in the short term. Dan Pickering, Investment Chief at Pickering Energy Partners, said that "市場終將找到新的正常水準，但每加侖2.85美元的汽油價格不會是那個新常態。" [1]
With the summer driving season approaching, gasoline prices may rise above $4 per gallon again later in 2026 [1, 2, 3, 4, 5, 7].
The next key development to watch is the gradual resumption of oil tanker traffic through the Persian Gulf and the progress in restoring Middle East oil production capacity over the coming months.
