Gasoline did most of the damage in September’s inflation report. The Bureau of Labor Statistics said the gasoline index rose 9.1% in the month, “accounting for over half of the monthly all items increase” of 0.6%. Over the 12 months ending in September, gasoline is up 34.2% and the all-items index is up 3.7%, against 3.4% a month earlier.
A 9.1% month at the pump and a 34.2% year
The monthly figures are seasonally adjusted, and the bureau reported them on October 14. All items rose 0.6% in September after a 0.4% rise in August. Gasoline’s 9.1% jump was the largest single push, and the bureau’s CPI home page headlines the release “CPI for all items increases 0.6% in September; gasoline rises.”
The wider energy index rose 5.2% in September after a 2.1% gain in August, and it is up 20.4% over 12 months. The bureau attributes that yearly rise “in large part” to gasoline. Fuel oil, which heats some homes, is up 74.2% over the same year, a bigger percentage rise than gasoline.
A household whose gasoline spending tracked the index would feel the yearly rise directly. A driver who spent $150 a month on gasoline a year ago, buying the same amount, would now spend about $201, which is $150 times 1.342. That is arithmetic on the bureau’s index, not a figure the bureau publishes, and actual bills depend on how much a household drives.
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Before seasonal adjustment, the gasoline index rose 6.5% in September, while the unadjusted all-items index also rose 0.6%. The seasonal adjustment is what lifts the monthly gasoline figure to 9.1%. The 12-month rates quoted in this report, 3.7% overall and 34.2% for gasoline, compare September 2026 with September 2025 without adjustment.
Everything else rose far more slowly
Strip out food and energy and the picture changes. The bureau’s core index rose 0.3% in September and 2.6% over the year, a full point below the 3.7% headline. The bureau ties the energy index’s climb largely to gasoline, so a household that drives little and a household that commutes can read the same report and feel different inflation rates.
Groceries are the clearest contrast. The food index was unchanged in September and is up 2.5% over the year, and food at home fell 0.1% in the month and is up 1.8% over 12 months. That is less than half the pace of prices overall. Food away from home rose 0.2% in the month and is up 3.5% over the year.
Shelter rose 0.4% in September and is up 3.2% over the year. Apparel rose 0.3% in the month and 3.4% over the year. Airline fares rose 1.2% in September and are up 22.4% over the year, which matters mostly to households that fly.
Core inflation held at 0.3% in both August and September, so the speed-up in the headline came from outside the core. Energy supplied it. Medical care is up 1.5% over the year, less than half the headline rate, and the index for communication, which declined 0.2% in September, adds a small drag in the other direction.
Prescriptions and groceries that got cheaper
Several items fell in September. The prescription drugs index declined 1.2% in the month, and medical care commodities, a group that includes drugs, fell 0.7% over the month and are down 3.3% over 12 months. Medical care as a whole rose 0.1% in September after falling 0.2% in August.
In the grocery aisle, dairy and related products fell 0.9% in September, with milk down 2.0%, and meats, poultry, fish and eggs fell 0.5%, with beef down 1.0%. The bureau said three of the six major grocery food group indexes declined. For a household that shops mostly at the grocery store, September was a flat month.
For a household shopping on a fixed budget, the split matters. The categories that fell or stayed flat in September are the ones bought week after week, such as milk, beef and prescriptions, while the category that jumped is the one bought at the pump. Families who cut driving offset part of the rise, and those who cannot are carrying the full 34.2%.
Used cars and trucks rose 0.7% in September but are down 1.5% over 12 months. New vehicles rose 0.2% in the month and are up 0.6% over the year. Communication prices declined 0.2% in September. None of those moves approaches the gasoline swing in size, which is the reason the energy line decided the month.
What the 3.7% means against a household budget
The 3.7% yearly rate is up from 3.4% in August, so the yearly rate accelerated by 0.3 percentage points. Prices overall cost 3.7% more than a year earlier. For a household, the lived rate depends on the mix: heavy driving pulls it above the headline, grocery-heavy spending pulls it below.
The next reading comes soon. The bureau’s release schedule puts the October 2026 consumer price index at 8:30 a.m. Eastern on Tuesday, November 10, 2026. Whether gasoline keeps climbing, levels off or gives back part of September’s 9.1% decides whether the 3.7% rate rises again or finally starts to come down.
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This article was produced with AI assistance and edited for accuracy against the sources linked above.
