US petrol reached a national average of $3.98 per gallon on Monday — up 36% from $2.93 before the war began on 28 February. This is the fastest single-month increase in 30 years. California exceeded $5 per gallon. Bank of America Institute data shows household petrol spending rose more than 14% year-over-year1.
Prices had already climbed to $3.88 nationally just days earlier. The continued rise — despite Sunday's Brent crude crash to $99.94 on Trump's talks announcement — reflects the familiar lag between crude markets and the retail pump. With Brent rebounding to $102–$104 on Monday, erasing roughly a third of Sunday's drop, retail prices have no immediate reason to fall. The International Energy Agency documented an 8-million-barrel-per-day supply loss, the largest on record, and Goldman Sachs's head of oil research Daan Struyven has warned Brent could surpass its 2008 all-time high of $147.50 if Hormuz flows remain depressed for 60 days. The crude market underpinning these pump prices is not stabilising; it is oscillating between diplomatic hope and battlefield reality.
The 36% increase functions as a consumption tax that falls hardest on those who can least absorb it. Lower-income households spend a disproportionate share of disposable income on fuel, drive older and less efficient vehicles, commute longer distances, and cannot shift to remote work. The Bank of America Institute's 14% year-over-year spending figure captures real household strain — not wholesale price movement but money leaving family accounts. American households collectively pay an estimated $300 million more per day at the pump compared to pre-war levels. That cost is not distributed by income bracket; it is distributed by miles driven and gallons burned.
The political pressure is sharpening on multiple fronts. Heritage Foundation president Kevin Roberts warned last week that the war risks producing "stagflation before midterms". The Pentagon's $200 billion funding request faces bipartisan resistance — Republican leaders reportedly lack the votes within their own caucus, and Representative Lauren Boebert has publicly declared herself "a no on any war supplementals"2. At $3.98 nationally and climbing, petrol prices translate the war's geopolitical stakes into a concrete cost that compounds with every fill-up — the single economic indicator Americans encounter most frequently, and the one most directly tied to the question of how long this campaign continues.
