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Financial tools for understanding prices, value, and purchasing power.

BLS average price

How much did diesel fuel cost in September 2025?

Diesel fuel averaged $3.73 per gallon in September 2025.

$3.73

per gallon in September 2025

Adjusted with CPI-U, that is about $3.86 in 2026 dollars.

See calculation

Source: U.S. Bureau of Labor Statistics Average Price Data, APU000074717. Imported from BLS bulk time-series files (raw published monthly values).

Related historical prices

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Data: U.S. Bureau of Labor Statistics — CPI-U. Series CUUR0000SA0, base period 1982–84 = 100. Coverage: 1913–2026. April CPI is used for 2026 until the annual average is published.

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