US households pay $763 extra on fuel in six months of Iran war

September 7, 2026 at 02:30 PM2 min

This digest was compiled by AI from multiple sources — links to the originals are below.

US consumers have paid an additional $100bn for petrol and diesel in the six months since the US-Israel war on Iran began on February 28, according to Brown University's Watson Institute. The added cost works out to roughly $763 per household, based on an estimated 131 million households nationwide. Petrol prices have climbed 39 percent to $4.15 a gallon, while diesel has jumped more than 60 percent to $5.90 a gallon.

Key Facts

US consumers have paid an additional $100bn for petrol and diesel since the US-Israel war on Iran began on February 28, according to Brown University's Watson Institute.
The average US household has spent $763 extra on fuel in six months, based on an estimated 131 million households nationwide.
Petrol prices have climbed 39 percent from about $2.98 to $4.15 a gallon, while diesel has risen more than 60 percent from $3.67 to $5.90 per gallon.
California has the nation's highest average petrol price at $5.85 per gallon, followed by Washington state at $5.51 and Hawaii at $5.39.
Indiana has the country's lowest petrol price at an average of $3.43 per gallon.

Fuel Price Surge

The war on Iran has driven fuel costs up across all 50 states, with petrol accounting for the larger share of the added expense because Americans use far more of it than diesel. Petrol prices have climbed 39 percent, from about $2.98 to $4.15 a gallon ($0.79 to $1.09 per litre). Diesel has jumped even more sharply, rising more than 60 percent from $3.67 to $5.90 per gallon ($0.97 to $1.56 per litre). Prices are highest on the West Coast, especially in California, where high fuel taxes and carbon pricing programmes were already pushing costs up before the war started.

Regional Price Differences

According to the American Automobile Association, California has the nation's highest average petrol price at $5.85 per gallon ($1.55 per litre). Washington state follows at $5.51, Hawaii at $5.39, Alaska at $5.03 and Oregon at $5.01. Indiana has the country's lowest petrol price at an average of $3.43 per gallon ($0.91 per litre).

Food Price Impact

Oil and gas touch nearly every stage of the food chain, from fertiliser and tractor fuel on farms to refrigeration and insulation in cold storage to plastic packaging and truck fuel for transport. As oil prices rise, these added costs accumulate at each step: production, storage, packaging and delivery. By the time food reaches supermarket shelves, those additional costs are passed on to consumers as higher prices. In lower-income countries, where populations spend a far greater share of their earnings on food and import large quantities of grain and fertiliser, rising oil prices could rapidly translate into food shortages.