Gas is up in every state. Americans are still filling up.

Pump prices are about 40% higher than a year ago. Gasoline use has not budged, so households have paid roughly $590 more since the Iran war began, and rural states feel it most.

Regular gas averaged $4.33 a gallon this week, according to AAA, about 40% more than a year earlier. Prices rose in every state. Diesel rose faster, by about 71%.

How much that costs a household depends on where it lives. This week The Wall Street Journal mapped Brown University estimates of the extra cost since prices spiked in March. Wyoming topped the list at $975 per household; Oregon was lowest at $339. Those estimates multiply each state's price increase by how much gas its households normally use.

That assumption has held up. Americans have kept buying about as much gasoline as a year ago and paying the higher price, and Arrivalist card data shows where that bill weighs most: in rural states, where gas already takes the biggest share of spending.

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The biggest increases were in Michigan (+61%), Wisconsin (+60%), Oklahoma (+56%), New Mexico (+54%) and Ohio (+53%). California still has the most expensive gas, at $6.22 a gallon, but the Pacific states saw the smallest increases: Washington (+22%), Oregon (+22%), Hawaii (+26%) and Alaska (+28%).

Diesel is up about 71%, led by Colorado, Oklahoma and Texas. That cost lands first on farms and freight.

Americans kept filling up

From March to September, the average price of regular gas was 30% higher than a year earlier, according to the US Energy Information Administration. The amount of gasoline Americans used barely moved: over the seven months it was essentially unchanged from a year earlier, and no month was more than 3% off.

Much of that driving, to work, school and the store, is hard to cut quickly. So the higher price went straight into household budgets: from the start of the Iran war on February 28 through October 9, the same gallons would have cost about $78 billion less at last year's prices. That is roughly $590 per household, or $300 per adult, in line with the Brown estimates.

That is the cost the Brown estimates describe. In card data it shows up as a bigger slice of spending: gas stations took 5.9% of all card spending from July to September, up from 5.5% a year earlier.

Rural states carry the heaviest load

A gallon costs about the same in North Dakota ($4.16) as in New Jersey ($4.27). What it means for a household budget is very different. In North Dakota, gas stations take 10.7% of all card spending, the highest share in the country. In New Jersey the share is 3.2%.

The top of the list is rural: North Dakota, West Virginia, Montana, Mississippi, Wisconsin, Maine, Kentucky and South Dakota. Longer distances and fewer alternatives to the car make fuel a bigger slice of spending. Gas took a larger share than a year earlier in 47 of the 49 states with comparable data.

For destinations, a bigger fuel bill is now part of every drive-in visitor's budget, most of all for visitors from rural states. Whether it trims trips or spending once visitors arrive is the next question, and one we are measuring.

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Gas prices: AAA state averages for regular gas and diesel on October 16, 2026, compared with AAA averages for the same date in 2025. Monthly national prices and gasoline use (weekly product supplied of finished motor gasoline) are from the US Energy Information Administration. The extra cost multiplies each week's gallons (February 28 to October 9) by the change in the weekly price from the same week a year earlier, and divides by about 132 million US households and 262 million adults (Census). It includes gasoline used by businesses, so the household and adult figures are upper bounds.

Household cost estimates: Brown University Climate Solutions Lab, as published by The Wall Street Journal on October 15, 2026.

Spending and travel: Arrivalist SpendInsights, January to September 2026 compared with the same months of 2025. Estimates based on in-person credit and debit card transactions, weighted to represent the US adult population. States are where cardholders live.

Gas station spending includes anything bought inside the station. Gas share is gas station spending divided by all card spending by the same adults. Hawaii's year-over-year gas figures are not shown because of a change in how its gas station purchases were recorded in September 2025. Recent months may be revised slightly as late transactions arrive.

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Gas prices: AAA state averages for regular gas and diesel on October 16, 2026, compared with AAA averages for the same date in 2025. Monthly national prices and gasoline use (weekly product supplied of finished motor gasoline) are from the US Energy Information Administration. The extra cost multiplies each week's gallons (February 28 to October 9) by the change in the weekly price from the same week a year earlier, and divides by about 132 million US households and 262 million adults (Census). It includes gasoline used by businesses, so the household and adult figures are upper bounds.

Household cost estimates: Brown University Climate Solutions Lab, as published by The Wall Street Journal on October 15, 2026.

Spending and travel: Arrivalist SpendInsights, January to September 2026 compared with the same months of 2025. Estimates based on in-person credit and debit card transactions, weighted to represent the US adult population. States are where cardholders live.

Gas station spending includes anything bought inside the station. Gas share is gas station spending divided by all card spending by the same adults. Hawaii's year-over-year gas figures are not shown because of a change in how its gas station purchases were recorded in September 2025. Recent months may be revised slightly as late transactions arrive.

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